Build CCExtractor on Mac

Fix unused parameter warning in sigusr1_handler #2313

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Run time

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Job	Run time
cmake_ocr_hardsubx	3m 38s
build_shell_hardsubx	2m 8s
cmake	2m 9s
build_rust	42s
build_shell	2m 27s
build_shell_system_libs	2m 33s
build_autoconf	2m 34s
build_autoconf_hardsubx	2m 26s
	18m 37s