qwtpolar: 1.1.0, new formula

Note that this is the [most recent 1.1.0-rc1 beta, in lieu of the current 1.0.1 stable](http://sourceforge.net/projects/qwtpolar/files/), which is not compatible with the current version of `qwt` (6.1) in Homebrew.
Not sure Mac-specific linking issue of the examples is necessarily a bug. Example sources are generally built _ad hoc_ by the user after a package is installed. In which case, the linking would work fine because `qwtpolar` woud be fully installed. Also, I find submitting patches upstream to both `qwt` and `qwtpolar` to be very arduous, and will not be wasting my time doing so for the example sources. 

The reason for the `qwtpolarconfig.pri` edits is explained [here](https://github.com/Homebrew/homebrew/pull/26152#issuecomment-51290946).