[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 #10 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Apparently this is supposed to work already, just not sure in which version:
https://github.com/mesonbuild/meson/issues/975

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