Delete support for MGA's proprietary HAL: unifdef USEMGAHAL.

This patch produced with:
	for f in `git grep -Fwl USEMGAHAL`; do
		unifdef -B -UUSEMGAHAL $f | sponge $f
	done

Adam Jackson wrote:

	Hey, so, remember back in the dark ages when dualhead was this
	insanely wild differentiating feature?  Matrox thought it was so
	special, in fact, that they hid most of the implementation of it
	(and a bunch of other stuff) in a binary-only blob called the
	HALlib.  As you'd expect it was pretty much a cut-and-paste of
	the relevant Windows code, and then some open glue to keep it
	working; clientlx.c is that glue.

	I guess the theory was that if you don't tell people which
	registers to duplicate to implement a second pipe in their own
	hardware, they won't figure it out?  A pretty eyeroll-worthy
	idea even at the time, and definitely not something we should be
	condoning anymore.

	Kill it with fire, but while you're at it, untangle the hideous
	mess of MGA_HAL() macros too.

Signed-off-by: Jamey Sharp <jamey@minilop.net>
Cc: Adam Jackson <ajax@redhat.com>

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