Ignore warnings from aux-item-def-scan.c about defined stuff that

isn't used.  This is an auto-generated file, and we can't help that it
includes a few unused labels and functions.  Ignore warning from
getopt about a function declaration that isn't a prototype.

scripts/xenofarm.sh

@@ -263,6 +263,8 @@ if test -f r/make.pass
 then
     egrep -i 'warning|\(w\)' r/makelog.txt \
     | grep -v regex\\.c \
+    | grep -v 'aux-item-def-scan\.c:.*: warning: .* defined but not used' \
+    | grep -v 'getopt.h:.*: warning: function declaration isn.t a prototype' \
     > r/makewarn.txt
     if test `wc -l < r/makewarn.txt` -gt 0
     then