Enable multi-processor compilation for Visual Studio

Author: usiems

extensions/PythonQt_QtAll/PythonQt_QtAll.pro

@@ -38,7 +38,7 @@ include ( ../../build/common.prf )
 include ( ../../build/PythonQt.prf )  
 TARGET = $$replace(TARGET, PythonXY, Python$${PYTHON_VERSION})
 
-CONFIG += qt strict_c++
+CONFIG += qt strict_c++ msvc_mp
 
 !static:!staticlib {
   CONFIG += dll

generator/generator.pri

@@ -5,6 +5,7 @@ TEMPLATE = app
 #CONFIG += cmdline -- does not work as expected with old Qt versions, f.e. is missing in 5.9
 CONFIG += console
 CONFIG -= app_bundle
+CONFIG += msvc_mp
 
 TARGET +=
 DEPENDPATH += $$GENERATORPATH tests parser

src/src.pro

@@ -9,7 +9,7 @@ TEMPLATE = lib
 
 DESTDIR    = ../lib
 
-CONFIG += qt
+CONFIG += qt msvc_mp
 CONFIG -= flat
 
 # allow to choose static linking through the environment variable PYTHONQT_STATIC