net-mail/checkpassword: remove outdated and incorrect RESTRICT

It was directly based on LICENSE="all-rights-reserved", but that was
since changed in commit 9890c2a05cebe6d1a4f28a9ab553bddb35bf3432. The
restricts weren't cleaned up with the license.

This also fixes horrible djbware recursion: virtual/checkpassword cannot
be installed on bindist-restricted systems, so it falls back to
vpopmail, which dies in the fires of qmail.

```
[nomerge       ] virtual/checkpassword-0-r2::gentoo
[ebuild  N     ]  net-mail/vpopmail-5.4.33-r9::gentoo  USE="-clearpasswd -ipalias -maildrop -mysql -postgres -spamassassin" 0 KiB
[ebuild  N     ]   virtual/qmail-1.03-r1::gentoo  0 KiB
[ebuild  N     ]    mail-mta/netqmail-1.06-r14::gentoo  USE="ssl -gencertdaily -highvolume -pop3 -qmail-spp -vanilla" 341 KiB
[ebuild  N     ]     virtual/checkpassword-0-r2::gentoo  0 KiB

Total: 4 packages (4 new), Size of downloads: 341 KiB

 * Error: circular dependencies:

(net-mail/vpopmail-5.4.33-r9:0/0::gentoo, ebuild scheduled for merge) depends on
 (virtual/qmail-1.03-r1:0/0::gentoo, ebuild scheduled for merge) (buildtime)
  (mail-mta/netqmail-1.06-r14:0/0::gentoo, ebuild scheduled for merge) (runtime)
   (virtual/checkpassword-0-r2:0/0::gentoo, ebuild scheduled for merge) (runtime)
    (net-mail/vpopmail-5.4.33-r9:0/0::gentoo, ebuild scheduled for merge) (runtime)
```

Fixes: 9890c2a05cebe6d1a4f28a9ab553bddb35bf3432
Fixes: https://github.com/gentoo/gentoo/pull/20791
Bug: https://bugs.gentoo.org/444424
Signed-off-by: Eli Schwartz <eschwartz@gentoo.org>

0 files changed, 0 insertions, 0 deletions