memory-util: move memeqbyte() & friends to src/fundamental/

src/basic/memory-util.c

@@ -20,27 +20,6 @@ size_t page_size(void) {
         return pgsz;
 }
 
-bool memeqbyte(uint8_t byte, const void *data, size_t length) {
-        /* Does the buffer consist entirely of the same specific byte value?
-         * Copied from https://github.com/systemd/casync/, copied in turn from
-         * https://github.com/rustyrussell/ccan/blob/master/ccan/mem/mem.c#L92,
-         * which is licensed CC-0.
-         */
-
-        const uint8_t *p = data;
-
-        /* Check first 16 bytes manually */
-        for (size_t i = 0; i < 16; i++, length--) {
-                if (length == 0)
-                        return true;
-                if (p[i] != byte)
-                        return false;
-        }
-
-        /* Now we know first 16 bytes match, memcmp() with self.  */
-        return memcmp(data, p + 16, length) == 0;
-}
-
 void* memdup_reverse(const void *mem, size_t size) {
         assert(mem);
         assert(size != 0);

src/basic/memory-util.h

@@ -57,12 +57,6 @@ static inline int memcmp_nn(const void *s1, size_t n1, const void *s2, size_t n2
 
 #define zero(x) (memzero(&(x), sizeof(x)))
 
-bool memeqbyte(uint8_t byte, const void *data, size_t length) _nonnull_if_nonzero_(2, 3);
-
-#define memeqzero(data, length) memeqbyte(0x00, data, length)
-
-#define eqzero(x) memeqzero(x, sizeof(x))
-
 static inline void* mempset(void *s, int c, size_t n) {
         memset(s, c, n);
         return (uint8_t*) s + n;