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[libc] Undef all the libc symbols before the implementation

Any function of the library can be implemented using a
macro, so in the implementation file is a good idea to
undef the name of the function to avoid problems.

--- a/libc/src/atexit.c

+++ b/libc/src/atexit.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <stdlib.h>

+#undef atexit

 extern void (*_atexitf[_ATEXIT_MAX])(void);

--- a/libc/src/atoi.c

+++ b/libc/src/atoi.c

@@ -2,6 +2,7 @@

 #include <ctype.h>

 #include <stdlib.h>

+#undef atoi

 int

 atoi(const char *s)

--- a/libc/src/ctype.c

+++ b/libc/src/ctype.c

@@ -2,6 +2,7 @@

 #define __USE_MACROS

 #include <ctype.h>

+#undef ctype

 unsigned char _ctype[255] = {

 	_C,_C,_C,_C,_C,_C,_C,_C,                        /* 0-7 */

--- a/libc/src/exit.c

+++ b/libc/src/exit.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <stdlib.h>

+#undef exit

 void (*_atexitf[_ATEXIT_MAX])(void);

--- a/libc/src/localeconv.c

+++ b/libc/src/localeconv.c

@@ -1,5 +1,6 @@

 #include <locale.h>

 #include <limits.h>

+#undef localeconv

 struct lconv *

 localeconv(void)

--- a/libc/src/memchr.c

+++ b/libc/src/memchr.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef memchr

 void *

 memchr(const void *s, int c, size_t n)

--- a/libc/src/memcmp.c

+++ b/libc/src/memcmp.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef memcmp

 int

 memcmp(const void *s1, const void *s2, size_t n)

--- a/libc/src/memcpy.c

+++ b/libc/src/memcpy.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef memcpy

 void *

 memcpy(void * restrict dst, const void * restrict src, size_t n)

--- a/libc/src/memmove.c

+++ b/libc/src/memmove.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef memmove

 void *

 memmove(void *dst, const void *src, size_t n)

--- a/libc/src/memset.c

+++ b/libc/src/memset.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef memset

 void *

 memset(void *s, int c, size_t n)

--- a/libc/src/rand.c

+++ b/libc/src/rand.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <stdlib.h>

+#undef rand

 static int next;

--- a/libc/src/setlocale.c

+++ b/libc/src/setlocale.c

@@ -2,6 +2,7 @@

 #include <locale.h>

 #include <stddef.h>

+#undef setlocale

 char *

 setlocale(int category, const char *locale)

--- a/libc/src/strcat.c

+++ b/libc/src/strcat.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strcat

 char *

 strcat(char * restrict dst, const char * restrict src)

--- a/libc/src/strchr.c

+++ b/libc/src/strchr.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strchr

 char *

 strchr(const char *s, int c)

--- a/libc/src/strcmp.c

+++ b/libc/src/strcmp.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strcmp

 int

 strcmp(const char *s1, const char *s2)

--- a/libc/src/strcoll.c

+++ b/libc/src/strcoll.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strcoll

 int

 strcoll(const char *s1, const char *s2)

--- a/libc/src/strcpy.c

+++ b/libc/src/strcpy.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strcpy

 char *

 strcpy(char * restrict dst, const char * restrict src)

--- a/libc/src/strcspn.c

+++ b/libc/src/strcspn.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strcspn

 size_t

 strcspn(const char *s1, const char *s2)

--- a/libc/src/strlen.c

+++ b/libc/src/strlen.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strlen

 size_t

 strlen(const char *s)

--- a/libc/src/strncat.c

+++ b/libc/src/strncat.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strncat

 char *

 strncat(char * restrict dst, const char * restrict src, size_t n)

--- a/libc/src/strncmp.c

+++ b/libc/src/strncmp.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strncmp

 int

 strncmp(const char *s1, const char *s2, size_t n)

--- a/libc/src/strncpy.c

+++ b/libc/src/strncpy.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strncpy

 char *

 strncpy(char * restrict dst, const char * restrict src, size_t n)

--- a/libc/src/strpbrk.c

+++ b/libc/src/strpbrk.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strpbrk

 char *

 strpbrk(const char *s1, const char *s2)

--- a/libc/src/strrchr.c

+++ b/libc/src/strrchr.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strrchr

 char *

 strrchr(const char *s, int c)

--- a/libc/src/strspn.c

+++ b/libc/src/strspn.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strspn

 size_t

 strspn(const char *s1, const char *s2)

--- a/libc/src/strstr.c

+++ b/libc/src/strstr.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strstr

 char *

 strstr(const char *s1, const char *s2)

--- a/libc/src/strtok.c

+++ b/libc/src/strtok.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strtok

 char *

 strtok(char * restrict s, const char * restrict delim)

--- a/libc/src/strxfrm.c

+++ b/libc/src/strxfrm.c

@@ -1,6 +1,7 @@

 /* See LICENSE file for copyright and license details. */

 #include <string.h>

+#undef strxfrm

 size_t

 strxfrm(char * restrict dst, const char * restrict src, size_t n)

--- a/libc/src/tolower.c

+++ b/libc/src/tolower.c

@@ -2,6 +2,7 @@

 #define __USE_MACROS

 #include <ctype.h>

+#undef tolower

 int

 tolower(int c)