VS2013: Adjust python3 to 12.0 vcproj version

Change-Id: Ic4566e8a199d3f31d6d4cb2d3fd41ad7b762c02a
Reviewed-on: https://gerrit.libreoffice.org/10162Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

external/python3/ExternalProject_python3.mk

@@ -35,10 +35,12 @@ $(call gb_ExternalProject_get_state_target,python3,build) :
 		MAKEFLAGS= MSBuild.exe pcbuild.sln /t:Build \
 			/p:Configuration=$(if $(MSVC_USE_DEBUG_RUNTIME),Debug,Release) \
 			/p:Platform=$(if $(filter INTEL,$(CPUNAME)),Win32,x64) \
-			$(if $(filter 100,$(VCVER)), \
-				/ToolsVersion:4.0, \
-				/p:PlatformToolset=$(if $(filter 80,$(WINDOWS_SDK_VERSION)),v110,v110_xp) \
+			$(if $(filter 100,$(VCVER)),/p:PlatformToolset=v100 \
+				/p:VisualStudioVersion=10.0) \
+			$(if $(filter 110,$(VCVER)),/p:PlatformToolset=$(if $(filter 80,$(WINDOWS_SDK_VERSION)),v110,v110_xp) \
 				/p:VisualStudioVersion=11.0) \
+			$(if $(filter 120,$(VCVER)),/p:PlatformToolset=v120 \
+				/p:VisualStudioVersion=12.0) \
 	,PCBuild)
 
 else