cygport: latest diffutils issues warning

[Charles Wilson]

The -u0 syntax has been deprecated, and now causes this message:

>>> Checking packages for missing or duplicate files
diff: `-0' option is obsolete; use `-U 0'
diff: Try `diff --help' for more information.
diff: `-0' option is obsolete; use `-U 0'
diff: Try `diff --help' for more information.


Fixed as below.

--
Chuck
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