A tiny patch to build macOS native binary of comet

This patch is provided to build comet search engine on macOS. Comet is peptide search engine for mass spectrometry.

Target version of the comet to build: 2019015.

how to build

1. download original source code of comet from https://sourceforge.net/projects/comet-ms/files/comet_2019015.zip/download
2. apply the patch to source code.
3. execute make without any arguments.