CppTools: Fix compilation with MSVC

Change-Id: I6a304b978738573bfbea7797b3c3d610abde7374
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cpptools/cppfunctionsfilter.cpp

@@ -29,6 +29,7 @@
 
 #include "cppfunctionsfilter.h"
 
+using namespace CppTools;
 using namespace CppTools::Internal;
 
 CppFunctionsFilter::CppFunctionsFilter(CppLocatorData *locatorData)

src/plugins/cpptools/cpplocatorfilter.cpp

@@ -32,6 +32,7 @@
 
 #include <QStringMatcher>
 
+using namespace CppTools;
 using namespace CppTools::Internal;
 
 CppLocatorFilter::CppLocatorFilter(CppLocatorData *locatorData)