For some reason, having NDEBUG defined when #including assert.h causes assert() to hang us. This should just
cause assert() to nop (it is #defined to be (void)0 in that case).
I cleaned up the #includes a bit to make sure all the source files properly included xorg-config.h
Only quartzStartup.c and darwinKeyboard.c do not include it. I ran into some weird crashes when they did which I'm looking into...
1) Fixed a bug where XQUARTZ was #defined when auto but not when --enable-xquartz
2) Cleaned up missing #includes and function prototypes.
3) Fixed some invalid C syntax problems
4) Removed a bunch of dead code
5) Cleaned up code to prevent some warnings
6) Bugfix in xpr/x-hook.c - looks like someone just forgot to finish writing code for hook_remove()... I only noticed it because gcc -Wall complained about reaching the end of a non-void function... lucky for us gcc is smarter than we are.
