Log Message:
Restore DragonFly ability to build Quake

A number of switches in the Quake makefile are no longer recognized
by the system compiler in DragonFly (gcc 4.4), e.g. -m486 and
-mpentium.  These switches have alternatives such as mtune= that
allows Quake to build on i386-DragonFly, so the existing patches were
updated to used them.

i386-NetBSD-5.99 was verified as well.  i386-NetBSD-5.1 remains
broken due to an unrelated X11 header buildlink problem
(Xxf86dga.h vs xf86dga.h)