build: Add check-style.py helper script

This script uses uncrustify to detect code style breaks in/around the
given SHA diff. There's two ways to use it:

 - `check-style.py --sha $SHA` prints in stdout the diffs with the
   changes suggested to the modifications done between HEAD and $SHA.
   The default with no --sha specified is HEAD^

   This is meant for integration in CI, in order to show code style
   differences, and suggest a set of changes.

 - `check-style.py -r` in addition amends the changes in the last
   commit. This is ideal to rewrite all commits in a branch one by
   one with the suggested changes, e.g.:

   `$ git rebase origin/master --exec "./check-style -r"`

One caveat is that there is per-function granularity in the suggested
code changes, so the script might suggest to fix style in unmodified
portions of the changed functions.

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