Windows: Remove explicit usage of _WIN32_WINNT and WINVER macros

The are set in a central place, in the precompile header file.
Or as DEFAULT_DEFINES when the precompile header file is not used.

Change-Id: Ie020f916b64eabcd5a8153f4be5474986f5afed5
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/debugger/procinterrupt.cpp

@@ -40,10 +40,6 @@ static inline QString msgCannotInterrupt(qint64 pid, const QString &why)
 }
 
 #if defined(Q_OS_WIN)
-
-#undef _WIN32_WINNT
-#define _WIN32_WINNT 0x0501 /* WinXP, needed for DebugBreakProcess() */
-
 #include <utils/winutils.h>
 #include <windows.h>
 

src/plugins/debugger/registerpostmortemaction.cpp

@@ -23,10 +23,6 @@
 **
 ****************************************************************************/
 
-#ifndef _WIN32_WINNT
-#define _WIN32_WINNT 0x0400
-#endif
-
 #include "registerpostmortemaction.h"
 
 #include <registryaccess.h>

src/plugins/debugger/shared/hostutils.cpp

@@ -28,10 +28,6 @@
 #ifdef Q_OS_WIN
 
 #include <QTextStream>
-
-// Enable Win API of XP SP1 and later
-#undef _WIN32_WINNT
-#define _WIN32_WINNT 0x0502
 #include <windows.h>
 #include <utils/winutils.h>
 #include <tlhelp32.h>