Don't do DCG on OSX #142

Job	Run time
mac_and_windows (release, windows2019-vs2019-clang)	1m 8s
mac_and_windows (release, windows2022-vs2022-msvc)	22m 37s
linux (release, centos7, clang)	7s
mac_and_windows (release, macos-clang)	15s
linux (release, centos7, gcc)	7s
linux (release, centos7, nvhpc)	1m 45s
mac_and_windows (debug, windows2019-vs2019-clang)	2m 57s
linux (release, alma8, clang)	1m 16s
mac_and_windows (debug, windows2022-vs2022-msvc)	1m 14s
mac_and_windows (debug, macos-clang)	13s
linux (release, alma8, gcc)	43s
linux (release, ubuntu1604, clang)	14s
linux (release, ubuntu1604, gcc)	9s
linux (release, ubuntu1804, clang)	6s
linux (release, ubuntu1804, gcc)	5s
linux (release, ubuntu2004, clang)	1m 31s
linux (release, ubuntu2004, gcc)	1m 22s
linux (release, ubuntu2004, nvhpc)	2m 42s
linux (debug, centos7, clang)	6s
linux (debug, centos7, gcc)	6s
linux (debug, centos7, nvhpc)	1m 58s
linux (debug, alma8, clang)	58s
linux (debug, alma8, gcc)	42s
linux (debug, ubuntu1604, clang)	9s
linux (debug, ubuntu1604, gcc)	5s
linux (debug, ubuntu1804, clang)	4s
linux (debug, ubuntu1804, gcc)	11s
linux (debug, ubuntu2004, clang)	1m 11s
linux (debug, ubuntu2004, gcc)	1m 24s
linux (debug, ubuntu2004, nvhpc)	3m 16s
	48m 41s

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