coverity#705326 deliberate fallthrough in switch

I imagine its deliberate anyway, always has been
this way since 2000

Change-Id: I45fd654aeec2a5c753c38d20febd2f820044bb32

tools/source/inet/inetmime.cxx

@@ -3101,6 +3101,7 @@ void INetMIMEEncodedWordOutputSink::finish(bool bWriteTrailer)
                 }
                 m_rSink << "?=";
             }
+            //fall-through
             case CODING_ENCODED_TERMINATED:
                 if (m_rSink.getColumn() + nSize
                         > m_rSink.getLineLengthLimit() - 1)