[Bug 667306] discoverer: don't use unportable vararg macro

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667306
  GStreamer | gst-plugins-base | git

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|discoverer: Defines new     |discoverer: don't use
                   |my_g_string_append_printf   |unportable vararg macro
                   |macro without arguments     |

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