Warn if streaming textures were removed from current SF packages

[Xymanek]

X2ModBuildCommon/build_common.ps1

Lines 1187 to 1188 in 9c81722

	# TODO: current logic doesn't account for case when a package (which has/had textures) is removed from the seekfree list.
	# We will keep shipping the TFC (with useless data) in this case without any warnings

(or if textures were removed from the package)