Re-sign Mac Applications before creating install package
See merge request OpenMW/openmw!2418
(cherry picked from commit 1dd392d33d)
52501b7b Re-sign Mac Applications before creating install package
e4f04390 Merge commit 'cd8b20439ec707574826679a8f851546c78e294e' into re-sign-mac-applications
71f6f950 Make Mac Plugins osgPlugins symlink relative
9f7e1324 Made CMake 3.19 requirement specific to macOS app packaging.