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Revert "[dev] Add memrchr"

This reverts commit a3a90734a04b065b429ab4810068a4f74386272e.
Memrchr is a non standard function.

--- a/include/string.h

+++ b/include/string.h

@@ -19,7 +19,6 @@

 extern int strncmp(const char *s1, const char *s2, size_t n);

 extern size_t strxfrm(char * restrict s1, const char * restrict s2, size_t n);

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

-extern void *memrchr(const void *s, int c, size_t n);

 extern char *strchr(const char *s, int c);

 extern size_t strcspn(const char *s1, const char *s2);

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

--- a/src/libc/string/Makefile

+++ b/src/libc/string/Makefile

@@ -4,7 +4,6 @@

 include ../rules.mk

 OBJS = memchr.o\

-       memrchr.o \

        memcmp.o\

        memcpy.o\

        memmove.o\

--- a/src/libc/string/memrchr.c

+++ /dev/null

@@ -1,13 +1,0 @@

-#include <string.h>

-

-#undef memrchr

-

-void *

-memrchr(const void *s, int c, size_t n)

-{

-	unsigned char *p = s;

-

-	for (p += n-1; n > 0 && *p != c; --p)

-		n--;

-	return (n == 0) ? NULL : p;

-}