Add a warning for notifying excessive MimeTypes being specified

Submitted by Pacho Ramos

Assigned to Hans Petter Jansson @hpj

Link to original bug (#18817)

Description

This comes from: http://bugzilla.gnome.org/show_bug.cgi?id=552466#c5

I think that would be useful that desktop-file-validate would show a warning when a general MimeType and its child are specified at the same time

Thanks a lot :-)