Debian's codesearch shows that gpgme_op_assuan_transact is only used by gpa and
a configure test in kdelibpim for its own copy of gpgme. In gpa it is harmless
to enable this. The only effect is that a status line callback will see a
status keyword "#" and status callbacks should always ignore unknown status lines.

Let's enable it by default.

Fixed with commit b5e16b0