VS2013: Adjust coinmp to 12.0 vcproj version

Change-Id: I3b069278297c489b0aeb54ebef484c73dee503c0
Reviewed-on: https://gerrit.libreoffice.org/10158Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

external/coinmp/ExternalProject_coinmp.mk

@@ -21,6 +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) \
 	,CoinMP/MSVisualStudio/v9)
 
 else