CMake: use version flags if Git isn't found #12106
Merged
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Some build systems (e.g. Nix) strip out the .git folder before building.
In order to preserve the revision info, they could simply pass
DOLPHIN_WC_REVISION
,DOLPHIN_WC_DESCRIBE
andDOLPHIN_WC_BRANCH
to the CMake flags. However, after #12007, this wasn't possible anymore (I suppose accidentally).This PR restores that.