MinGW: Fix warning about _WIN32_WINNT being redefined

Change-Id: Ia097316b1eb16fbb0868f8b3f42e0ad5892f4573
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

src/libs/utils/winutils.cpp

@@ -31,6 +31,7 @@
 #include "qtcassert.h"
 
 // Enable WinAPI Windows XP and later
+#undef _WIN32_WINNT
 #define _WIN32_WINNT 0x0501
 #include <windows.h>
 

src/plugins/debugger/procinterrupt.cpp

@@ -43,6 +43,7 @@ static inline QString msgCannotInterrupt(int pid, const QString &why)
 
 #if defined(Q_OS_WIN)
 
+#undef _WIN32_WINNT
 #define _WIN32_WINNT 0x0501 /* WinXP, needed for DebugBreakProcess() */
 
 #include <utils/winutils.h>

src/plugins/debugger/shared/hostutils.cpp

@@ -34,6 +34,7 @@
 #include <QTextStream>
 
 // Enable Win API of XP SP1 and later
+#undef _WIN32_WINNT
 #define _WIN32_WINNT 0x0502
 #include <windows.h>
 #include <utils/winutils.h>

src/plugins/projectexplorer/devicesupport/localprocesslist.cpp

@@ -45,6 +45,7 @@
 
 #ifdef Q_OS_WIN
 // Enable Win API of XP SP1 and later
+#undef _WIN32_WINNT
 #define _WIN32_WINNT 0x0502
 #include <windows.h>
 #include <utils/winutils.h>