macos: content-type tests do succeed
It should not be needed anymore to allow the gio/content-type tests to fail.
They work (on my machine ;) ).
The only thing that seems kinda odd is that g_content_type_guess
returns UTI types on macOS, instead of mime-types.
Fixes #1251 (closed)
See also #1392
Edited by Arjan Molenaar