drm config

[Chuck Robey]

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I went back to trying to get my complete xorg to build, because I have finally
chased down all of the config and logging functions, down in the dark ratholes
they were hidden in.  My build is dying in xserver/hw/kdrive/ephyr, because when
it makes ephyrdriext.c, it can't include drm.h.

My install dir is /usr/X11R7.4 (my choice) and my drm.h is in
X11R7.4/include/drm/drm.h.  I can't seem to correctly pass along anything at the
util/modular/build.sh to get that directory added to the include.  I tried
sticking it into XSERVERLIBS_CFLAGS, but that didn't seem to penetrate the
config down there, and to be honest, I'm miserable at doing the autotools.

Anyone knokw where I could stick a -I line so that it'd make it into that dir,
so I can fix my build?  I couldn't tell you why the autotools aren't picking up
the location of drm.h on their own, I AM passing in my install dir via -D.
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