[Bug 206220] mail/mutt: GSSAPI not using Heimdal from Ports, leads to environ corruption

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206220

            Bug ID: 206220
           Summary: mail/mutt: GSSAPI not using Heimdal from Ports, leads
                    to environ corruption
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: freebsd at phil.spodhuis.org
                CC: Udo.Schweigert at siemens.com
             Flags: maintainer-feedback?(Udo.Schweigert at siemens.com)
                CC: Udo.Schweigert at siemens.com

Created attachment 165535
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=165535&action=edit
mail/mutt Makefile patch for GSSAPI Uses system

mail/mutt rolls its own GSSAPI handling system, looking for installed
libraries, rather than employing the "Uses" knobs (which probably post-date the
mutt Port's GSSAPI support).

When linking against OpenSSL from Ports, this results in one mutt process
pulling in both libcrypto.so.8 from Ports and libcrypto.so.7 from the base
system (FreeBSD 10.1), leading to environ corruption problems when running
external commands, which complain at startup (libc routines detect the
corruption).  These look like:

    sh: environment corrupt; missing value for SOME_VAR

and can be seen when, eg, viewing a PGP-signed mail with GnuPG integration
turned on.

This patch switches mail/mutt to use the GSSAPI "Uses" system, and has been
verified to work for me with Heimdal from Ports.  I haven't tested the other
variants, but they're textbook copy/paste.

I previously reported this via mail to the port maintainer on 2015-05-24 (at
which time, the maintainer was out-of-office) and haven't chased between then
and now.

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