Fix LLVM version check yet again

There were two problems with LLVM version checking:

- The parser would only parse x and x.y formatted versions. E.g. 1.2.3
  would be rejected.

- The version check was too strict and would reject x.y formatted
  versions. E.g. when we support version 7 it'd reject 7.0 ("LLVM
  version 7.0") and only accept 7 ("LLVM version 7").

We now parse versions with arbitrarily deep minor numbering (x.y.z.t...)
and accept versions as long as the major version matches the supported
version (e.g. 7.1, 7.1.2, 7.1.2.3 ...).

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