Revert "Allow OS X builds on Travis to fail"
Revert "Allow OS X builds on Travis to fail"

This reverts commit 2e3e8694c54795f35a4a5a78b23de1258077d64b.

Build failures were fixed with 1f7916b1c53f5db8c84c1a3ca441410c6ab72fff.

der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat