Quick makefile to speed up EFI loader testing

SRCDIR= /tmp/image
OUTPUT= /tmp/img
EFIFAT= boot1.efifat
DEPS=   $(SRCDIR)/boot/support.4th \
        $(SRCDIR)/boot/loader.conf

all: /tmp/img

$(OUTPUT): $(OUTPUT).part
        mkimg -s gpt -p efi:=$(EFIFAT) -p freebsd-ufs:=$(>) -o $(@)

$(OUTPUT).part: $(DEPS)
        makefs -B little -o label=FreeBSD_Install $(@) $(SRCDIR)