Fix compilation of MinGW-w64

Change-Id: I059dacd10a585e35b34c8e190f6a5e2a9de2f1d4
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

src/libs/utils/tcpportsgatherer.cpp

@@ -46,7 +46,7 @@
 #if defined(Q_OS_WIN) && defined(Q_CC_MINGW)
 
 // Missing declarations for MinGW. This requires MinGW with gcc 4.6.
-#if __GNUC__ == 4 && __GNUC_MINOR__ < 7
+#if __GNUC__ == 4 && __GNUC_MINOR__ < 7 && (!defined(__MINGW64_VERSION_MAJOR) || __MINGW64_VERSION_MAJOR < 2)
 typedef enum { } MIB_TCP_STATE;
 #endif