lcms2: Don't hard code Win32 platform on Windows

Change-Id: I60701b2c0a0ec06ada24b397107b337676dbd319
Reviewed-on: https://gerrit.libreoffice.org/13229Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>

external/lcms2/ExternalProject_lcms2.mk

@@ -19,7 +19,7 @@ $(call gb_ExternalProject_get_state_target,lcms2,build):
 	$(call gb_ExternalProject_run,build,\
 		MSBuild.exe lcms2_DLL.vcxproj \
 			/p:Configuration=$(if $(MSVC_USE_DEBUG_RUNTIME),Debug,Release) \
-			/p:Platform=Win32 /p:TargetName=lcms2 \
+			/p:Platform=$(if $(filter INTEL,$(CPUNAME)),Win32,x64) /p:TargetName=lcms2 \
 			$(if $(filter 110,$(VCVER)),/p:PlatformToolset=$(if $(filter 80,$(WINDOWS_SDK_VERSION)),v110,v110_xp) /p:VisualStudioVersion=11.0) \
 	,$(if $(filter 120,$(VCVER)),Projects/VC2013/lcms2_DLL,Projects/VC2010/lcms2_DLL))
 else