Log Message:
gnupg2: add bzip2 and zlib to PKG_SUGGESTED_OPTIONS

Based on the previous default behave on NetBSD add bzip2 and zlib to the
suggested options. In the past gnupg2 automatically detected bzip2 and
zlib from the system and enabled these options also if no buildlink file
was present.

bzip2 and zlib still stay as options because if gnupg2 remote agent
forwarding is used both gnupg2 versions (local and remote) need to provide
the same compression options. This allow the user to build gnupg2 with or
without compression options if needed.

PKGREVISION bump because new suggested options might require an rebuild on
different operating systems if bzip2 and zlib was not accidentally detected
and enabled.

Reviewed by wiedi