dependnecies: generalize version suffix stripping code

This replaces calls to .rstrip('git'), .rstrip('svn') with a regex that
takes the leading numbers and dots, and throws away the rest. This also
moves the code up to the ConfigToolDepdency level, since these config
tools are of various quality and some of them are good, and some are
not. This shouldn't affect well behaved tools.

This should future proof LLVM against future suffixes (like someone
doing something strange like using Mercurial as a VCS).

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