MFH: r460052 r460230

Update glib to 2.50.3.

Also redo the kqueue patches. Now we patch files only once, and add some
bits that got lost somewhere (which is probably my fault). Which where
causing crashes when for example nautilus or thundar where monitoring
directories and files where added/removed.

PR: 199872

Fix another crash bug in the kqueue backend.

PR: 199872 217946

Approved by: ports-secteam (swills@)