Don't build devilutionx.mpq for Vita

[StephenCWills]

This just seems appropriate, since it's packaging assets directly in the vpk.

[StephenCWills]

Never mind, AJenbo just pointed this out to me.

devilutionX/CMakeLists.txt

Lines 429 to 444 in 3e7791f

	if(BUILD_ASSETS_MPQ OR SRC_DIST)
	vita_create_vpk(devilutionx.vpk ${VITA_TITLEID} devilutionx.self
	VERSION ${VITA_VERSION}
	NAME ${VITA_APP_NAME}
	FILE Packaging/vita/sce_sys sce_sys
	FILE ${DEVILUTIONX_MPQ} devilutionx.mpq
	)
	else()
	vita_create_vpk(devilutionx.vpk ${VITA_TITLEID} devilutionx.self
	VERSION ${VITA_VERSION}
	NAME ${VITA_APP_NAME}
	FILE Packaging/vita/sce_sys sce_sys
	FILE Packaging/resources/assets assets
	${VITA_TRANSLATIONS_LIST}
	)
	endif()