cmake: Set GMT_BUILD_DATE to the current date or the last commit date #8501
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When building the GMT release tarball (not a git repository), I see an error like:
The error was introduced in #7468, because for release tarballs, there is no
.gitdirectory, sogit logcommand doesn't work.This PR fixes the issue by setting the
GMT_BUILD_DATEto the current UTC date by default, and only use the last commit date if it's a git repository.Patches #7468.