Log message:
textproc/xmlada: Build with USE_LANGUAGES+= ada

1) Remove lang/gnat-aux dependency
2) USE_LANGUAGES+= ada (invokes lang/gcc-aux dependency)
3) Improve shared library rpath definition required when built by compiler
   not installed at ${LOCALBASE}
4) Restore use of pkgsrc wrappers

Log message:
textproc/xmlada: Remove DESTDIR from library rpaths

Removing DESTDIR from the shared library rpaths required a change in the
compiler.  To tell GNAT not to add in DESTDIR rpaths, the -R switch
needs to be added to each library's option set.  GNAT-AUX 20110627nb2
required at a minimum to take advantage of these switches.

Additionally, issues with installed files' permissions were fixed.

Log message:
Update textproc/xmlada to version 4.2.0.0

Log message:
restore some Makefile parts which got lost when I added DESTDIR support

Log message:
add xmlada-4.1w, an XML library for Ada, from John Marino per PR pkg/44437