updates for xorgproto 2019.2, libX11 1.6.9, and libXvMC 1.0.12.

define HAVE__XEATDATAWORDS. (XXX move into ${X11FLAGS.THREADLIB}).

Add missing LIBDPLIBS, found by using 'LDFLAGS += -Wl,-z,defs' and sort
src/external/mit/xorg/lib/Makefile to match the new order.

Install pkgconfig files. Where applicable, remove .if 0 code that tried to
do the same thing.

initial import of the crossbuild framework for modular Xorg. this
is heavily based upon the work rtr@ did on src/x11, but hacked to
work for modern modular Xorg source split.

the sources will live

initial import of the crossbuild framework for modular Xorg. this
is heavily based upon the work rtr@ did on src/x11, but hacked to
work for modern modular Xorg source split.

the sources will live in xsrc/external/mit/<package>/dist.

documentation on using this will come when the above directories
are fully populated. there are 192 of them so it may take some time
before that is completed.

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