[Bug 745144] gstvalue: Make sure GST_FOURCC_ARGS produces printable characters

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745144

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 297853
  --> https://bugzilla.gnome.org/attachment.cgi?id=297853&action=edit
gstvalue: Make sure GST_FOURCC_ARGS produces printable characters

Some systems will crash if we use non-printable characters in print/debug
statements.

Make sure that GST_FOURCC_ARGS never does that

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