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[lib/c] Remove wcnslen.c

It is not a c99 interface.

--- a/lib/c/target/script/objlst.mk

+++ b/lib/c/target/script/objlst.mk

@@ -20,7 +20,7 @@

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

          isxdigit.o toupper.o tolower.o ctype.o setlocale.o \

          localeconv.o atoi.o atol.o atoll.o atexit.o abort.o exit.o \

-         errno.o _sys_errlist.o strnlen.o wcsnlen.o

+         errno.o _sys_errlist.o strnlen.o

 #rules

 __abs.o: ../../__abs.c

@@ -313,7 +313,4 @@

 vsprintf.o: ../../vsprintf.c

 	$(CC) $(SCC_CFLAGS) ../../vsprintf.c -c

-

-wcsnlen.o: ../../wcsnlen.c

-	$(CC) $(SCC_CFLAGS) ../../wcsnlen.c -c

--- a/lib/c/vfprintf.c

+++ b/lib/c/vfprintf.c

@@ -343,7 +343,7 @@

 		case 's':

 			if (flags & LONG) {

 				ws = va_arg(va, wchar_t *);

-				len = wcsnlen(ws, conv.prec);

+				/* len = wcsnlen(ws, conv.prec); */

 				goto wstrout;

 			} else {

 				s = va_arg(va, char *);

--- a/lib/c/wcsnlen.c

+++ /dev/null

@@ -1,10 +1,0 @@

-#include <stdio.h>

-#include <wchar.h>

-

-#undef wcsnlen

-

-size_t

-wcsnlen(const wchar_t *s, size_t maxlen)

-{

-	return 0;

-}