[quake3] ibook G3 Quake 3

[Ryan C. Gordon]

>>This is bug...it shouldn't matter what system it is built on, and it
>>should force com_altivec to 0 for you on a G3 (even though the Altivec
>>code still exists in the binary). Please send me a backtrace of where
>>this dies on a G3 in this condition so I can fix it.

Ok, this is fixed in svn revision #398. We were correctly detecting
whether or not you have altivec, but we forgot to actually disable the
altivec codepaths in the case that you don't (my bug, sorry!).

svn revision #398 also adds an attempt at Altivec detection for non-OSX
platforms, lifted from SDL's source...PowerPC Linux people, please let
me know if this doesn't compile and/or doesn't work.

--ryan.