remove unnecessary file

drivers/usermode-sdk/Makefile

-#  VFD Demo System
-#  By CSK
-#
-
-
-# NOTE: do not alter the order of the folders, they are arranged based on the dependencies
-SUBDIRS:= infra \
-	  deps-wraps \
-	  rpusbdisp-drv \
-	  demo
-
-
-.PHONY: all clean install listsubs
-
-listsubs:
-	@for subdir in $(SUBDIRS) ; do $(MAKE) -C $$subdir $(MAKECMDGOALS) || exit 1; done
-
-all: listsubs
-
-clean: listsubs
-
-install: listsubs
-
-distclean:
-	$(MAKE) clean
-	rm -r -f config.log config.status Makefile Makefile.conf
-	rm -r -f .obj .output