[Bug 791670] Meson: Fix environment when cross building

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791670
Bug 791670 depends on bug 789316, which changed state.

Bug 789316 Summary: Add Meson support in cerbero
https://bugzilla.gnome.org/show_bug.cgi?id=789316

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

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