cryfs: Fix HEAD installation

[smessmer]

• It needs the libomp dependency and corresponding build flags

• It needs a non-shallow git clone to compute version number correctly

• Have you followed the guidelines for contributing?

• Have you checked that there aren't other open pull requests for the same formula update/change?

• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?

• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

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[fxcoudert]

Head cannot be built without OpenMP?

[smessmer]

It can be built without OpenMP by passing in -DDISABLE_OPENMP=on, but that would result in a much slower mount time for CryFS file systems (well, on multi core systems at least).

[smessmer]

Why does CI fail for this? I didn't find a helpful error message on Jenkins, just

failed: brew doctor

[fxcoudert]

C: 34: 24: Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.

[fxcoudert]

Thanks @smessmer