Enable build on all supported linux platforms.

The build did not work when configuring to linux-g++-64,
although the platform is supported.

Task-number: QTBUG-41918
Change-Id: If2c8a5722d7d6b0ca28a99763531d8ffd9534de7
Reviewed-by: Andras Becsi <andras.becsi@digia.com>
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>

tools/qmake/mkspecs/features/functions.prf

@@ -2,7 +2,7 @@ defineTest(isPlatformSupported) {
   static: return(false)
   osx:lessThan(QMAKE_XCODE_VERSION, 5.1): return(false)
 
-  linux-g++|win32-msvc2013|macx-clang: return(true)
+  linux-g++*|win32-msvc2013|macx-clang: return(true)
   boot2qt: return(true)
   return(false)
 }