nvmutil: remove memcmp/memcpy/strrchr/rename

i had this idea in my head of later porting this
to k&r c for fun. but screw it.

compiling on everything since 1989 is enough

Signed-off-by: Leah Rowe <leah@libreboot.org>

util/nvmutil/lib/string.c

@@ -81,43 +81,3 @@ xstrxlen(const char *scmp, unsigned long maxlen)
 
 	return xstr_index;
 }
-
-char *
-x_c_strrchr(const char *s, int c)
-{
-	const char *p = NULL;
-
-	for ( ; *s; s++)
-		if (*s == (char)c)
-			p = s;
-
-	if (c == '\0')
-		return (char *)s;
-
-	return (char *)p;
-}
-
-void *
-x_v_memcpy(void *dst, const void *src, unsigned long n)
-{
-	unsigned char *d = (unsigned char *)dst;
-	const unsigned char *s = (const unsigned char *)src;
-
-	while (n--)
-		*d++ = *s++;
-
-	return dst;
-}
-
-int
-x_i_memcmp(const void *a, const void *b, unsigned long n)
-{
-	const unsigned char *pa = (const unsigned char *)a;
-	const unsigned char *pb = (const unsigned char *)b;
-
-	for ( ; n--; ++pa, ++pb)
-		if (*pa != *pb)
-			return *pa - *pb;
-
-	return 0;
-}