Fix cmake bug when ldc is a submodule #860
Merged
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This change fixes a cmake error that can happen when ldc is included as a git submodule.
The change is a selection of updates from a more recent version of GetGitRevisionDescription.cmake at https://github.com/rpavlik/cmake-modules.
Note for error verification - the error doesn't happen if there is a tag on the submodule commit.