fixes #2506: mac binary with proper version and copyright meta-informations (Info.plist)

Due a bug in QT (https://bugreports.qt-project.org/browse/QTBUG-21267), the mac binary of the last release contains bulk meta informations.

The url-handler (bitcoin://) is also not working in current release

Should be fixed with this commit.

Signed-off-by: Jonas Schnelli <jonas.schnelli@include7.ch>