Remove makewarn.txt and ckprgwarn.txt if they are empty. Create

ckprgfail.txt and cause the ckprg steg to fail if the string "error"
is found in the output (case insensitive).

scripts/xenofarm.sh

@@ -296,6 +296,8 @@ then
     if test `wc -l < r/makewarn.txt` -gt 0
     then
 	mv r/make.pass r/make.warn
+    else
+	rm r/makewarn.txt
     fi
 fi
 
@@ -308,6 +310,16 @@ then
     if test `wc -l < r/ckprgwarn.txt` -gt 0
     then
 	mv r/ckprg.pass r/ckprg.warn
+	egrep -i 'error' r/ckprgwarn.txt \
+	> r/ckprgfail.txt
+	if test `wc -l < r/ckprgfail.txt` -gt 0
+	then
+	    mv r/ckprg.warn r/ckprg.fail
+	else
+	    rm r/ckprgfail.txt
+	fi
+    else
+	rm r/ckprgwarn.txt
     fi
 fi