develop/ktcc: Post-SVN tidy

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

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

@@ -0,0 +1,16 @@
+/* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
+#include <string.h>
+
+size_t strlen(const char* str)
+{
+    int d0;
+    register int __res;
+    __asm__ __volatile__(
+        "repne\n\t"
+        "scasb\n\t"
+        "notl %0\n\t"
+        "decl %0"
+        : "=c"(__res), "=&D"(d0)
+        : "1"(str), "a"(0), "0"(0xffffffff));
+    return __res;
+}