[PATCH v2] Move extensions from extmod/libdbe/librecord to Xext/

[Tomas Carnecky]

This is the second itration of my patchset that removes extmod. The first version
is available in <1280690903-14972-1-git-send-email-tom at dbservice.com>. Changes from
the first version:

 - The first and third patch has been reviewed by Peter. The small whitespace
   fixup is included in the third patch.

 - The s/INITARGS/void/ change is now a separate patch.

 - The SELinux module is now built into libXextbuiltin.la (aka libXext-Xorg.la)
   so there shouldn't be any link-time issues anymore. However, I am not able
   to test that because I have no system with SELinux installed. Especially
   the new xorg.conf parsing code needs to be verified that it actually works.

 - While removing extmod I also saw that RECORD and DBE could be moved into
   Xext. I hope it's ok to include that patch in this patchset.

 - The last patch tries to remove all traces of extmod/libdbe/librecord from the
   sources. I can't guarantee that I found all references to those modules.

tom