textproc/xmlada: Upgrade version 220.127.116.11 => 18.104.22.168, overhaul make system
Due to the unavailability of a public repository, this version uses
Adacores 2015 distribution of xmlada. It's probably a minor update
from the previous one.
The major change, however, is the creation of a custom makefile to build
and install xmlada. Why? because gnatmake will lose the ability to
build project files in the near future, so xmlada makefiles were changed
to use gprbuild to build and itself it. One problem: gprbuild needs
xmlada as a build dependency. (and it also needs gprbuild to build
itself!!) I could have chosen to keep using gnatmake, but I decided to
bite the bullet, fix it correctly now and not have to get stuck by it
by future versions of gnat that remove project management from gnatmake.
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