[skip ci] Add settings options to conanfile (thanks to @ngrodzitski)
[skip ci] Add settings options to conanfile (thanks to @ngrodzitski)

Settings will be removed from package_id after calling `self.info.header_only()`, but they a helpful for Conan CMake helper to detect generator correctly.

https://github.com/martinmoene/nonstd-lite-project/issues/34

martinmoene/gsl-lite,martinmoene/gsl-lite,martinmoene/gsl-lite