[Bug 789057] Fix -Wenum-conversion warnings

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789057

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 361677
  --> https://bugzilla.gnome.org/attachment.cgi?id=361677&action=edit
properly cast extension enums

OMX's allow 3rds party to define extensions using their own enums
(like OMX_VIDEO_CODINGEXTTYPE) and to be used as the general
ones (like OMX_VIDEO_CODINGTYPE).
Properly cast those to fix -Wenum-conversion warnings from some
compilers such as clang.

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