fix broken build process due to imported patch

I obviously did not check carefully enough the results of
that import. Thanks to Tomas Heinrich for alerting us, see:
https://github.com/rsyslog/rsyslog/issues/35#issuecomment-36146610

NOTE: this problems was not in released code, "just" the git tree.

tools/ompipe.c

@@ -305,6 +305,7 @@ ENDfreeWrkrInstance
 
 
 BEGINtryResume
+	instanceData *__restrict__ const pData = pWrkrData->pData;
 CODESTARTtryResume
 	if(pData->fd == -1) {
 		rsRetVal iRetLocal;