develop/ktcc: Post-SVN tidy

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

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

@@ -0,0 +1,12 @@
+/* Copyright (C) 2021 Logaev Maxim (turbocat2001), GPLv2 */
+
+#include <stdio.h>
+
+int sprintf(char* buffer, const char* format, ...)
+{
+  va_list va;
+  va_start(va, format);
+  const int ret = _vsnprintf(_out_buffer, buffer, (size_t)-1, format, va);
+  va_end(va);
+  return ret;
+}