libcxx: remove include <windows.h> from support\win32\support.h

[Yaron Keren]

Windows.h is not required.
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Index: include/support/win32/support.h
===================================================================
--- include/support/win32/support.h	(revision 194657)
+++ include/support/win32/support.h	(working copy)
@@ -23,7 +23,6 @@
 #ifndef NOMINMAX
 #define NOMINMAX
 #endif
-#include <Windows.h>
 
 extern "C" {