develop/ktcc: Post-SVN tidy

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

programs/develop/ktcc/libc.obj/source/stdio/perror.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void perror(const char *s) {
+	debug_printf("%s: It's some error, maybe...\n", s);
+}