Log Message:
devel/florist: Upgrade from version 3.15p to GPL 2012

From its beginning, Florist required a gcc 3.x series Ada compiler to build,
and this compiler hasn't been building for most platforms for quite some
time.  With the recent import of lang/gcc-aux which accepts
USE_LANGUAGES+= ada, it's possible to build Florist again.

1) Update to Adacore-maintained version, GPL 2012
2) Update the license (GPLv3)

The time elapsed between versions is approximately 12 years, but no
Changelog exists to show what has been updated.