Keep only base/extractor.[cc|h].

third_party/minicrt/struplwr.cc

Index: third_party/minicrt/struplwr.cc
diff --git a/third_party/minicrt/struplwr.cc b/third_party/minicrt/struplwr.cc
deleted file mode 100644
index 311f7ab50cdec60f2c2544b1b6c16aa1e1615d59..0000000000000000000000000000000000000000
--- a/third_party/minicrt/struplwr.cc
+++ /dev/null
@@ -1,20 +0,0 @@
-//==========================================
-// LIBCTINY - Matt Pietrek 2001
-// MSDN Magazine, January 2001
-//==========================================
-#include "libctiny.h"
-#include <windows.h>
-#include <string.h>
-
-// Force the linker to include USER32.LIB
-#pragma comment(linker, "/defaultlib:user32.lib")
-
-extern "C" char *  __cdecl strupr(char *s) {
-    CharUpperBuff( s, lstrlen(s) );
-    return s;
-}
-
-extern "C" char *  __cdecl strlwr(char *s) {
-    CharLowerBuff( s, lstrlen(s) );
-    return s;
-}