Qemu requires gettext, glib, libffi, and pixman. DTC is built
as a submodule.
On Mavrick provide a pkg-config command so avoid needing a pkgconfig.
The one here is only just good enough to work.
Provide an internal autotools build including libtool so qemu can
be built from git.
Rework the RTEMS build set files to point to the new location.
Move the files into devel, this follows the ports naming in
FreeBSD.
Update the macros, defaults, and options to support this.
