zip2zip: support included an excluded file

Make needs to exclude all files that match a filespec except for
those specified in a list.  Add a -X argument that overrides the
-x argument to allow files be included that were previously
excluded.

Bug: 69500920
Test: zip2zip_test.go
Change-Id: Icc8aebc788b53bcdde73a39c9c7cf3107a049251