Add unistd.h to gztools.cpp

fhanau / Efficient-Compression-Tool

Fast and effective C++ file optimizer

Apache License 2.0

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Closed nomoon closed 7 years ago

nomoon commented 7 years ago

Fixes compilation error where "unlink()" is not found

This occurs on OSX Sierra using the latest Clang or GCC7

fhanau commented 7 years ago

Thank you. This appears to get masked by Xcode, which is why I didn't catch it earlier.