security/py-gssapi: Fix builds against non-base GSSAPI -- needs a committer

[John W. O'Brien]

Hello FreeBSD-Python,

Are there any friendly neighborhood committers available to take this
patch [0]?

[0] https://bugs.freebsd.org/229639

Thank you,

-- 
John W. O'Brien
OpenPGP keys:
    0x33C4D64B895DBF3B

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