Log Message:

Add modular-xorg-server version 1.4 (X11 7.3).  Note that when building
drivers with this, wip/pixman must be buildlinked in.  Also, this server
requires xf86-input-keyboard-1.2.2 (just bump the version in pkgsrc),
renderproto 0.9.3, and the newer version of xf86dgaproto/libXxf86dga.
There may be other dependency updates I forgot to mention here.

Also, I included a patch from debian which allows you to specify
an XKBPATH environment variable at runtime, if that's useful to anyone.

Tested on NetBSD/amd64.