Suppress filename output in unzip call.

[HexDecimal]

The unzip command on MacOS does not seem to handle Python's UTF-8 locale correctly. Running unzip -q should skip outputting these non-ASCII filenames in otherwise working runs.

In theory this change may also improve the performance of large archives.

Fixes #181

[codecov[bot]]

Codecov Report

Merging #182 (41ebb89) into master (7e05593) will decrease coverage by 0.30%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #182      +/-   ##
==========================================
- Coverage   95.47%   95.18%   -0.30%     
==========================================
  Files          14       14              
  Lines        1084     1267     +183     
==========================================
+ Hits         1035     1206     +171     
- Misses         49       61      +12     

Impacted Files	Coverage Δ
delocate/tools.py	94.78% <100.00%> (-1.34%)	:arrow_down:

... and 1 file with indirect coverage changes

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[HexDecimal]

@matthew-brett GitHub Actions has dropped support for macos-10.15, this will affect test coverage.

[HexDecimal]

Merged since tests can't run with this PR and the fix has been verified.