VS2013: Override ToolsVersion setting

Otherwise those external projects will fail, because with only VS2013 installed
there is no ToolsVersion 4.0 (which is set inside the VC projects files).

http://msdn.microsoft.com/en-us/library/bb383985.aspx

Change-Id: I144ba1ef95372226ebadb082e3a78155cca316fd

external/coinmp/ExternalProject_coinmp.mk

@@ -21,7 +21,7 @@ $(call gb_ExternalProject_get_state_target,coinmp,build) :
 			/p:Platform=Win32 \
 			$(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) \
+			$(if $(filter 120,$(VCVER)),/p:PlatformToolset=v120 /p:VisualStudioVersion=12.0 /ToolsVersion:12.0) \
 	,CoinMP/MSVisualStudio/v9)
 
 else

external/cppunit/ExternalProject_cppunit.mk

@@ -19,7 +19,7 @@ $(call gb_ExternalProject_get_state_target,cppunit,build) :
 	    PROFILEFLAGS="$(if $(MSVC_USE_DEBUG_RUNTIME),Debug,Release) \
 			$(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)" \
+			$(if $(filter 120,$(VCVER)),/p:PlatformToolset=v120 /p:VisualStudioVersion=12.0 /ToolsVersion:12.0)" \
 		&& msbuild.exe cppunit_dll.vcxproj /p:Configuration=$${PROFILEFLAGS}  \
 		&& cd ../DllPlugInTester \
 		&& msbuild.exe DllPlugInTester.vcxproj /p:Configuration=$${PROFILEFLAGS} \

external/libgltf/ExternalProject_libgltf.mk

@@ -43,7 +43,7 @@ $(call gb_ExternalProject_get_state_target,libgltf,build) :
 	$(call gb_ExternalProject_run,build,\
 		msbuild.exe libgltf.vcxproj \
 			/p:Configuration=$(if $(MSVC_USE_DEBUG_RUNTIME),Debug,Release) \
-			$(if $(filter 120,$(VCVER)),/p:PlatformToolset=v120 /p:VisualStudioVersion=12.0) \
+			$(if $(filter 120,$(VCVER)),/p:PlatformToolset=v120 /p:VisualStudioVersion=12.0 /ToolsVersion:12.0) \
 			$(if $(filter 110,$(VCVER)),/p:PlatformToolset=$(if $(filter 80,$(WINDOWS_SDK_VERSION)),v110,v110_xp) \
 				/p:VisualStudioVersion=11.0) \
 			$(if $(filter 100,$(VCVER)),/p:PlatformToolset=v100 \

external/python3/ExternalProject_python3.mk

@@ -40,7 +40,7 @@ $(call gb_ExternalProject_get_state_target,python3,build) :
 			$(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) \
+				/p:VisualStudioVersion=12.0 /ToolsVersion:12.0) \
 	,PCBuild)
 
 else