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.
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