Merge r407,r508 from libarchive.googlecode.com: Correctly handle

Zip entries that are zero length but stored with deflate.  This
is arguably a silly thing to do (deflating a zero-length file actually
makes it bigger) but apparently quite a few Zip writers do this.
This was broken in two places:  archive_write_disk disliked being asked
to write data to zero-length files (even if the write was zero-length)
and zip_read_file_header tripped over itself when non-regular files
had compressed bodies.

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