security/gnupg: Update to 2.4.6

• There is a bug in 2.4.6 that is related to --enable-gpg-is-gpg2 option of configure script and result in error about file name of man pages. To fix it we need to patch doc/Makefile.am and regenerate doc/Makefile.in. So,
  1. Add autoreconf to USES.
  2. Replace patch to configure with that to m4/gpg-error.m4.
  3. Add gettext-tools to USES. Running autoreconf requires autopoint command included in gettext-tools and it is necessary even if NLS option is off.
• Pet portclippy
• Tidy up Makefile with portfmt.

ReleaseNotes: https://lists.gnupg.org/pipermail/gnupg-announce/2024q4/000486.html
PR: 282594
Approved by: maintainer timeout