[Gentoo] X modularizing, day 4

Updated a bunch of stuff today; it was good to see that somebody fixed a bunch of build breakages (Matthieu Herrb, I think). Still a lot of packages doing weird stuff with xprint, using an Xaw m4 macro without stating a dependency upon Xaw among other things.

Adam, here’s a patch for libdrm.pc to make xorg not die when trying to build with DRI.

I also posted a file full of things I’ve got issues with so far in the modularization.