grep: don't automatically decompress

[mknos]

• When run on a binary file, grep should search it as a binary file
• Regular grep should not decompress a file (this version was decompressing based on file extension)
• Adopt the -Z flag from OpenBSD which makes grep behave as zgrep [1]
• Sync POD manual

1. http://man.openbsd.org/grep#Z

%gzip -9k ar # create ar.gz
%perl grep ar ar.gz # original filename stored in binary
grep: ar.gz: binary file matches
%perl grep perl ar.gz # no match
%perl grep -Z perl ar.gz # match after decompression
#!/usr/bin/perl
License: perl

[coveralls]

Pull Request Test Coverage Report for Build 11790844202

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 73.069%

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Totals
Change from base Build 11774186393:	-0.7%
Covered Lines:	350
Relevant Lines:	479

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💛 - Coveralls

[briandfoy]

changes: add -Z to operate in zgrep mode (don't automatically decompress everything)