video/logo: simplify cmd_logo

# Create commands like "pnmtologo -t mono -n logo_mac_mono -o ..."

quiet_cmd_logo = LOGO    $@

	cmd_logo = $(pnmtologo) \

			-t $(patsubst $*_%,%,$(notdir $(basename $<))) \

			-n $(notdir $(basename $<)) -o $@ $<

      cmd_logo = $(pnmtologo) -t $(lastword $(subst _, ,$*)) -n $* -o $@ $<

$(obj)/%_mono.c: $(src)/%_mono.pbm $(pnmtologo) FORCE

$(obj)/%.c: $(src)/%.pbm $(pnmtologo) FORCE

	$(call if_changed,logo)

$(obj)/%_vga16.c: $(src)/%_vga16.ppm $(pnmtologo) FORCE

$(obj)/%.c: $(src)/%.ppm $(pnmtologo) FORCE

	$(call if_changed,logo)

$(obj)/%_clut224.c: $(src)/%_clut224.ppm $(pnmtologo) FORCE

	$(call if_changed,logo)

$(obj)/%_gray256.c: $(src)/%_gray256.pgm $(pnmtologo) FORCE

$(obj)/%.c: $(src)/%.pgm $(pnmtologo) FORCE

	$(call if_changed,logo)

# generated C files