[Bug 789316] meson recipe won't build

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789316

--- Comment #11 from Xavier Claessens <xclaesse at gmail.com> ---
I'm too lazy to check distro-by-distro which version of meson they have, so
this patch just always install meson and python3-pip and if "meson --version"
says it's too old it will pip install it.

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