openalpr 1.2 (new formula)

Hopefully this formula will get a little simpler once/if my upstream pull
request is accepted:

https://github.com/openalpr/openalpr/pull/55

A notable one-off in this formula is that I couldn't include a "depend_on" for tesseract, as the formula depends on the "--devel" version of tesseract.  See the "caveats" method for more info.
Why do you need to determine the version? Regardless, we'll need to use our actual version detection in there rather than your custom approach.