Patch proposal: quote gssapi paths and assume 64-bit gssapi lib

[A. Jesse Jiryu Davis]

I quote GSSAPI lib and include paths (since MIT installs them in
"C:\Program Files\MIT\Kerberos", with a space in the path), and change the
library name from gssapi32.lib to gssapi64.lib, which seems like a
more-likely-correct assumption these days.

Peace,
Jesse

patch
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