py-gssapi: Remove setup.py patch

Previously, two changes were made to python-gssapi's setup.py:

* Instead of using macOS' GSS.Framework on Mac OS X 10.7+, the minimum
  is raised to 10.9+.

* When not using GSS.Framework (that is, on Mac OS X below 10.9),
  instead of looking for a lib*.so file, look for a lib*.dylib file.

With the addition of the `kerberos5` variant, the above changes are no
longer needed:

* We force `kerberos5` use on Mac OS X below 10.9, so we don't need to
  change the minimum version in setup.py.

* When using the `kerberos5` variant, we short-circuit much of
  setup.py's detection logic by setting environment variables, so we
  don't need to change the code in setup.py.

python/py-gssapi/Portfile

@@ -22,8 +22,6 @@ checksums           rmd160  71966a7d6bf97fca5ccf27f687334b53f8bd1d85 \
 
 python.versions     39 310 311 312 313
 
-patchfiles          patch-setup.py.diff
-
 # python-gssapi knows when it's running on macOS, and automatically configures
 # itself to use macOS' GSSAPI Framework, which uses macOS' build of Heimdal
 # Kerberos.