Copy needed include files from EDK2. This is a minimal set gleened

Copy needed include files from EDK2. This is a minimal set gleened
from the .depend files after the build:
	cp -r ../vendor/edk2/MdePkg/Include sys/contrib/edk2
	cd lib/libefivar
	make
	pushd `make -V .OBJDIR`
	cat .depend*.o | grep sys/contrib | cut -d' ' -f 3 |
		sort -u | sed -e 's=/full/path/sys/contrib/edk2/==' > /tmp/xxx
	popd
	cd ../../sys/contrib/edk2
	rm -rf Include
	for i in `cat /tmp/xxx`; do
		svn cp svn+ssh://repo.freebsd.org/base/vendor/edk2/dist/MdePkg/$i $i
	done
	svn cp svn+ssh://repo.freebsd.org/base/vendor/edk2/dist/MdePkg/MdePkg.dec .

The original EDK2 repo is ~265MB, the MdePkg is ~23MB, all
MdePkg/Includes is ~7MB and this minimal set is ~1.3MB.

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