[Glamor] assorted patches

[Brian Paul]

Hi,

I was looking at glamor for the first time a few weeks ago and found a
few things to fix.  I'll post a few patches in a bit.

However, I don't have a working glamor environment set up so I haven't
actually tested the patches.  They're pretty simple though.

BTW, glamor_util.h is a bit of a mess.  It has a ton of macros that
should probably be inline or regular functions.  Is there any interest
in having that cleaned up?

-Brian