Regression in gunzip in 5.9.0 -- GZ files that used to uncompress no longer do

[tstanev]

Using the built-in gunzip results in error on certain gzip files (example attached). The error is code -3, Z_DATA_ERROR, "unknown compression method". The file used to gunzip fine with version 5.6.0 of node. Likely culprit (just guessing) is #5120. The same file can be decompressed without error using the OSX gunzip utility on the command line.
165.gz

• 5.9.0
• Darwin man7mx6h12.ads.autodesk.com 15.3.0 Darwin Kernel Version 15.3.0: Thu Dec 10 18:40:58 PST 2015; root:xnu-3248.30.4~1/RELEASE_X86_64 x86_64
• zlib

[jasnell]

Fix already landed in master: #5863
Should go out with the next v5 release.