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jbig2dec: Ignore extension segments that are not marked necessary.

Previously this was a fatal error, but it is better as a warning as
the extension segment has not been marked necessary as outlined in
the specification.

--- a/jbig2_segment.c

+++ b/jbig2_segment.c

@@ -234,7 +234,7 @@

         if (necessary) {

             return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "unhandled necessary extension segment type 0x%08x", type);

         } else {

-            return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "unhandled extension segment");

+            jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "unhandled non-necessary extension segment, skipping");

         }

     }