Log Message:
Share common pkgsrc bits between the aalib and aalib-x11 packages.  Shrink
the aalib-x11 package to installing just the libraries and headers and to
install them with new names so that aalib-x11 and aalib no longer conflict.
Also, remove the aalib-x11/buildlink.mk file as it will be no longer used.
This solves part of pkg/16354.