Move --child-silent-after-fork=yes from drd/tests/threaded-fork.vgtest to drd/tests/verify-xml-output

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12161 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/tests/verify-xml-output b/drd/tests/verify-xml-output
index 7fbd4b2..5bc4b10 100755
--- a/drd/tests/verify-xml-output
+++ b/drd/tests/verify-xml-output
@@ -16,7 +16,7 @@
   args="$(sed -n 's/^args: //p' $f)"
   vgopts="$(sed -n 's/^vgopts: //p' $f)"
   if eval $prereq; then
-    ../../vg-in-place --tool=drd --xml=yes --xml-file="$b-%q{USER}.xml" --xml-user-comment="<runBy>$(basename $0)</runBy>" --gen-suppressions=all $vgopts ./$prog $args
+    ../../vg-in-place --tool=drd --xml=yes --xml-file="$b-%q{USER}.xml" --xml-user-comment="<runBy>$(basename $0)</runBy>" --child-silent-after-fork=yes --gen-suppressions=all $vgopts ./$prog $args
     xmllint --noout --schema ../docs/drd-xml-output.xsd $b-${USER}.xml 2>&1 | tee $b.xmllint
   else
     echo "Skipping because $prereq failed"