[MacPorts] #27250: Add OpenSSH GSSAPI key exchange patch

[MacPorts]

#27250: Add OpenSSH GSSAPI key exchange patch
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 Reporter:  lassi.tuura@…        |       Owner:  jwa@…           
     Type:  enhancement          |      Status:  new             
 Priority:  Normal               |   Milestone:                  
Component:  ports                |     Version:                  
 Keywords:  haspatch             |        Port:  openssh         
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Comment(by lassi.tuura@…):

 I've added patches to portfile and to add to 'files' directory, for
 openssh currently in use in macports (5.9p1). The gsskex patch is just a
 refreshed version of swx.org.uk one (there is no patch for 5.9p1 there).

 The second apple-keychain.patch contains selected subset of differences
 between standard openssh and Apple's version, most notably the automatic
 integration with keychain, as per running diff against the version
 available from www.opensource.apple.com/source/OpenSSH. As far as I
 understand the license in the additional source files, they are ok for
 distribution in macports (= Apple BSD license). I didn't include quite all
 the differences, as some seemed deprecated (SACL), others can't be
 compiled without apparently internal private sources
 (__APPLE_CROSS_REALM__ requires OpenDirectoryPriv.h), others are
 effectively already in openssh (sandboxing). I can't really vouch for some
 of the additional configury options, but that's what the opensource
 version used.

 The second patch only applies after the gsskex one.

 I'd really appreciate if these patches, or some derivative of them, could
 be applied to the macports version.

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Ticket URL: <https://trac.macports.org/ticket/27250#comment:2>
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