[Bug 788273] fix build failure for Android Nougat

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788273

--- Comment #15 from Justin J. Kim <justin.joy.9to5 at gmail.com> ---
Regarding proxy-libintl, I added direct shell command to build it. Please,
review and give me advice if there's a nicer way.

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