Don't use symbolic links for git. #1102

Job	Run time
Build with ZTS	1m 46s
Test with embed	2m 39s
Build and Test (ubuntu-latest, 8.0, stable, 17, nts)	3m 1s
Build and Test (ubuntu-latest, 8.0, nightly, 17, nts)	2m 39s
Build and Test (ubuntu-latest, 8.1, stable, 17, nts)	2m 56s
Build and Test (ubuntu-latest, 8.1, nightly, 17, nts)	3m 4s
Build and Test (ubuntu-latest, 8.2, stable, 17, nts)	4m 13s
Build and Test (ubuntu-latest, 8.2, nightly, 17, nts)	2m 47s
Build and Test (ubuntu-latest, 8.3, stable, 17, nts)	2m 49s
Build and Test (ubuntu-latest, 8.3, nightly, 17, nts)	2m 45s
Build and Test (macos-latest, 8.0, stable, 15, nts)	1m 50s
Build and Test (macos-latest, 8.0, nightly, 15, nts)	1m 52s
Build and Test (macos-latest, 8.1, stable, 15, nts)	1m 53s
Build and Test (macos-latest, 8.1, nightly, 15, nts)	2m 28s
Build and Test (macos-latest, 8.2, stable, 15, nts)	2m 5s
Build and Test (macos-latest, 8.2, nightly, 15, nts)	1m 44s
Build and Test (macos-latest, 8.3, stable, 15, nts)	2m 16s
Build and Test (macos-latest, 8.3, nightly, 15, nts)	2m 2s
Build and Test (windows-latest, 8.0, nightly, 17, ts)	3m 15s
Build and Test (windows-latest, 8.0, nightly, 17, nts)	3m 35s
Build and Test (windows-latest, 8.1, nightly, 17, ts)	3m 15s
Build and Test (windows-latest, 8.1, nightly, 17, nts)	3m 16s
Build and Test (windows-latest, 8.2, nightly, 17, ts)	3m 49s
Build and Test (windows-latest, 8.2, nightly, 17, nts)	3m 32s
Build and Test (windows-latest, 8.3, nightly, 17, ts)	4m 2s
Build and Test (windows-latest, 8.3, nightly, 17, nts)	3m 53s
	1h 13m 26s

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