Don't use symbolic links for git. #1103

Job	Run time
Build with ZTS	1m 48s
Test with embed	2m 39s
Build and Test (ubuntu-latest, 8.0, stable, 17, nts)	2m 44s
Build and Test (ubuntu-latest, 8.0, nightly, 17, nts)	2m 59s
Build and Test (ubuntu-latest, 8.1, stable, 17, nts)	2m 39s
Build and Test (ubuntu-latest, 8.1, nightly, 17, nts)	2m 47s
Build and Test (ubuntu-latest, 8.2, stable, 17, nts)	4m 0s
Build and Test (ubuntu-latest, 8.2, nightly, 17, nts)	2m 55s
Build and Test (ubuntu-latest, 8.3, stable, 17, nts)	3m 1s
Build and Test (ubuntu-latest, 8.3, nightly, 17, nts)	2m 49s
Build and Test (macos-latest, 8.0, stable, 15, nts)	2m 11s
Build and Test (macos-latest, 8.0, nightly, 15, nts)	1m 52s
Build and Test (macos-latest, 8.1, stable, 15, nts)	1m 48s
Build and Test (macos-latest, 8.1, nightly, 15, nts)	2m 22s
Build and Test (macos-latest, 8.2, stable, 15, nts)	1m 50s
Build and Test (macos-latest, 8.2, nightly, 15, nts)	2m 2s
Build and Test (macos-latest, 8.3, stable, 15, nts)	1m 55s
Build and Test (macos-latest, 8.3, nightly, 15, nts)	2m 3s
Build and Test (windows-latest, 8.0, nightly, 17, ts)	3m 20s
Build and Test (windows-latest, 8.0, nightly, 17, nts)	4m 0s
Build and Test (windows-latest, 8.1, nightly, 17, ts)	3m 10s
Build and Test (windows-latest, 8.1, nightly, 17, nts)	3m 32s
Build and Test (windows-latest, 8.2, nightly, 17, ts)	3m 37s
Build and Test (windows-latest, 8.2, nightly, 17, nts)	3m 18s
Build and Test (windows-latest, 8.3, nightly, 17, ts)	3m 35s
Build and Test (windows-latest, 8.3, nightly, 17, nts)	4m 4s
	1h 13m 0s

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