gsettings schema compilation is automatically handled these days with
an
rpm file trigger that glib2 sets up. There's no need to add
glib-compile-schemas %postun and %postrans scripts any more (but they
won't hurt either and are required for EPEL7 if you want to keep the
same spec file).
But then why is this such a prominent "Issue" in the output review.txt file? And
why does it warn me even when nothing in the spec, patches, and/or source files include
the `glib-compile-schemas` command?