develop/ktcc: Post-SVN tidy

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

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

@@ -0,0 +1,19 @@
+#include <string.h>
+
+void* memcpy(void* _dest, const void* _src, size_t _n)
+{
+    int d0, d1, d2;
+    __asm__ __volatile__(
+        "rep ; movsl\n\t"
+        "testb $2,%b4\n\t"
+        "je 1f\n\t"
+        "movsw\n"
+        "1:\ttestb $1,%b4\n\t"
+        "je 2f\n\t"
+        "movsb\n"
+        "2:"
+        : "=&c"(d0), "=&D"(d1), "=&S"(d2)
+        : "0"(_n / 4), "q"(_n), "1"((long)_dest), "2"((long)_src)
+        : "memory");
+    return (_dest);
+}