[Bug 784848] fix meson build

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784848

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 355432
  --> https://bugzilla.gnome.org/attachment.cgi?id=355432&action=edit
meson: add gstomxmp3enc

Commit 02d493e85921596f7cac7ef4af02fde500e9a5d8 didn't add
gstomxmp3enc.c to meson.

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