[Bug 796957] closedcaptions: fixes when compiling with clang-6

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796957

--- Comment #2 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 373327
  --> https://bugzilla.gnome.org/attachment.cgi?id=373327&action=edit
closedcaption: comment out unused function

When compiling with clang-6 this error raises:

raw_decoder.c:411:1: error: unused function 'cpr1204_crc'
[-Werror,-Wunused-function]

This patch only comments it out.

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