Set /bigobj option for Visual Studio

Otherwise some object files might get too big when putting all code in
one file (which is useful when comparing with previous results)

Author: usiems

extensions/PythonQt_QtAll/PythonQt_QtAll.pro

@@ -69,6 +69,8 @@ unix {
 unix: target.path = $${INSTALL_PREFIX}/lib
 win32: target.path = /
 
+msvc:QMAKE_CXXFLAGS += /bigobj
+
 headers.files = $${HEADERS}
 headers.path = $${INSTALL_PREFIX}/include