gnupg2: add 'pth' as a dependency and run 'make check'
gnupg2: add 'pth' as a dependency and run 'make check'

This addresses issue #28, and also adds 'make check' to verify the build.

Signed-off-by: Adam Vandenberg <34c2b6407fd5a10249a15d699d40f9ed1782e98c@gmail.com>

UniqMartin/homebrew-versions,coeligena/homebrew-verscustomized,jimhe/homebrew-versions,Ashton-W/homebrew-versions,DomT4/homebrew-versions,heuermh/homebrew-versions