fixed compiling error for GCC

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@428 bbd45198-f89e-11dd-88c7-29a3b14d5316

libc/minilibc/string.c

@@ -41,13 +41,6 @@ int strcmp (const char *s1, const char *s2)
 	return (*s1 - *s2);
 }
 
-int strcmp (const char *s1, const char *s2)
-{
-	while (*s1 && *s1 == *s2)
-		s1++, s2++;
-	return (*s1 - *s2);
-}
-
 char* strcat(register char* s,register const char* t)
 {
 	char *dest = s;