Log Message:
devel/gnupg: Stop installing gpgsplit, because it conflicts with gnupg2

gpgsplit has been installed by gnupg(1) since 2002.  gpgsplit has also
been in tools/ within gnupg-2, but upstream recently moved it from
noinst_PROGRAMS to bin_PROGRAMS without noting this in NEWS.

Because gnugp2 is normal and gnupg remains for special cases, simply
drop gpgsplit from gnupg; we have no intent to save people from
installing gnupg2 -- only to continue to allow them to use the old gpg
binary for special uses.