[LLDB] Rework a MinGW build fix from D65691

That change didn't contain any explanation for this bit. There shouldn't
be any need for a check for MinGW ifdefs here, as long as the include
uses lowercase windows.h (as is used consistently elsewhere in
the llvm projects).

Differential Revision: https://reviews.llvm.org/D67894

llvm-svn: 372656

lldb/tools/lldb-vscode/VSCode.cpp

@@ -15,10 +15,8 @@
 #include "llvm/Support/FormatVariadic.h"
 
 #if defined(_WIN32)
-#ifndef __MINGW32__
 #define NOMINMAX
-#include <Windows.h>
-#endif // __MINGW32__
+#include <windows.h>
 #include <fcntl.h>
 #include <io.h>
 #endif