Don't use symbolic links for git. #1097

Job	Run time
Test with embed	2m 33s
Build with ZTS	1m 46s
Build and Test (ubuntu-latest, 8.0, stable, 17, nts)	1m 53s
Build and Test (ubuntu-latest, 8.0, nightly, 17, nts)	1m 54s
Build and Test (ubuntu-latest, 8.1, stable, 17, nts)	1m 55s
Build and Test (ubuntu-latest, 8.1, nightly, 17, nts)	1m 55s
Build and Test (ubuntu-latest, 8.2, stable, 17, nts)	1m 55s
Build and Test (ubuntu-latest, 8.2, nightly, 17, nts)	1m 54s
Build and Test (ubuntu-latest, 8.3, stable, 17, nts)	1m 53s
Build and Test (ubuntu-latest, 8.3, nightly, 17, nts)	1m 54s
Build and Test (macos-latest, 8.0, stable, 15, nts)	2m 10s
Build and Test (macos-latest, 8.0, nightly, 15, nts)	1m 51s
Build and Test (macos-latest, 8.1, stable, 15, nts)	1m 57s
Build and Test (macos-latest, 8.1, nightly, 15, nts)	1m 55s
Build and Test (macos-latest, 8.2, stable, 15, nts)	1s
Build and Test (macos-latest, 8.2, nightly, 15, nts)	1m 53s
Build and Test (macos-latest, 8.3, stable, 15, nts)	1s
Build and Test (macos-latest, 8.3, nightly, 15, nts)	1s
Build and Test (windows-latest, 8.0, nightly, 17, ts)	1m 52s
Build and Test (windows-latest, 8.0, nightly, 17, nts)	1m 52s
Build and Test (windows-latest, 8.1, nightly, 17, ts)	1m 51s
Build and Test (windows-latest, 8.1, nightly, 17, nts)	1m 52s
Build and Test (windows-latest, 8.2, nightly, 17, ts)	1m 48s
Build and Test (windows-latest, 8.2, nightly, 17, nts)	1m 51s
Build and Test (windows-latest, 8.3, nightly, 17, ts)	1s
Build and Test (windows-latest, 8.3, nightly, 17, nts)	1m 53s
	42m 21s

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