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.