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Add some C that will regen the firmware_patterns

All the good stuff here is from jsg at, I just munged it up to make it print
the other stuff.  Really this is just terrible but I am very much not a C
programmer.

firmware_patterns: gen_firmware_patterns
	$(.OBJDIR)/gen_firmware_patterns | sort | uniq > $@

gen_firmware_patterns: $@.c
	$(CC) -I /usr/src/sys/dev/pci/drm/amd/amdgpu \
	      -I /usr/src/sys/dev/pci/drm/i915       \
	      -I /usr/src/sys/dev/pci/drm/radeon     \
	      -o $@ $@.c 

clean:
	rm -f $(.OBJDIR)/gen_firmware_patterns