Revert "Only stop use of g_type_init with Glib 2.36"

This reverts commit 1ea79cc4669b5d760a1cc6a614eabe8223a9db6d.
Revert "Revert "Remove deprecated call to g_type_init""

This reverts commit deedb94b3948097b6e51fc0e90718b29c4eaeacc.