meta: move photon/libc to root

libc/string/memcmp.c

@@ -0,0 +1,14 @@
+#include <stddef.h>
+
+int memcmp(const void *a, const void *b, size_t n)
+{
+    const unsigned char *s1 = a, *s2 = b;
+
+    for (size_t i = 0; i < n; i++) {
+        if (s1[i] != s2[i]) {
+            return ((s1[i] < s2[i]) ? -1 : 1);
+        }
+    }
+
+    return 0;
+}