Fix common.sh to build amd64 binaries on 10.7 and 10.8
Update the 10.7 binaries.


git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/valgrind/scripts@169823 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/common.sh b/common.sh
index f1f2149..6bf5f2a 100755
--- a/common.sh
+++ b/common.sh
@@ -168,10 +168,10 @@
         build_valgrind "mac_10.6" "--build=amd64-darwin"
       elif system_is_lion
       then
-        build_valgrind "mac_10.7"
+        build_valgrind "mac_10.7" "--build=amd64-darwin"
       elif system_is_mountain_lion
       then
-        build_valgrind "mac_10.7"
+        build_valgrind "mac_10.8"
       else
         echo "You have Darwin kernel different from 9.X.X--11.X.X" >&2
         echo "Please, don't put the resulting binaries into Chromium SVN" >&2