develop/ktcc: Post-SVN tidy

- Move source code from `trunk` into program root directory.
- Update build files.

programs/develop/ktcc/libc.obj/source/string/memcmp.c

@@ -0,0 +1,15 @@
+/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
+#include <assert.h>
+#include <string.h>
+
+int memcmp(const void* s1, const void* s2, size_t n)
+{
+    if (n != 0) {
+        const unsigned char *p1 = s1, *p2 = s2;
+        do {
+            if (*p1++ != *p2++)
+                return (*--p1 - *--p2);
+        } while (--n != 0);
+    }
+    return 0;
+}