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[libc] Add strcspn()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -3,7 +3,7 @@

 LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

           strrchr.o strcat.o strncmp.o strncpy.o strncat.o strcoll.o \

-          strxfrm.o strtok.o strstr.o strspn.o \

+          strxfrm.o strtok.o strstr.o strspn.o strcspn.o \

           memset.o memcpy.o memmove.o memcmp.o memchr.o \

           isalnum.o isalpha.o isascii.o isblank.o iscntrl.o isdigit.o \

           isgraph.o islower.o isprint.o ispunct.o isspace.o isupper.o \

--- /dev/null

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

@@ -1,0 +1,19 @@

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

+

+#include <string.h>

+

+size_t

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

+{

+        size_t n;

+        int c;

+	const char *p;

+

+        for (n = 0; c = *s1++; ++n) {

+                for (p = s2; *p && *p != c; ++p)

+                        /* nothing */;

+                if (*p == c)

+                        break;

+        }

+        return n;

+}