[Bug 773674] meson: don't use subproject fallback for gst-validate if it won't work

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773674

--- Comment #4 from Thibault Saunier <tsaunier at gnome.org> ---
Review of attachment 338776:
 --> (https://bugzilla.gnome.org/review?bug=773674&attachment=338776)

Also this should not be needed as gst-validate is optionnal so if subproject
fails it should not fail the build, bug in mesón?

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