Roll new valgrind-variant (r138, which is Valgrind r13132, VEX r2564) binaries for Linux

scripts/common.sh

Index: scripts/common.sh
===================================================================
--- scripts/common.sh	(revision 169322)
+++ scripts/common.sh	(working copy)
@@ -19,6 +19,10 @@
   uname -r | grep 11\.[0-9]\.[0-9] >/dev/null
 }
 
+system_is_mountain_lion() {
+  uname -r | grep 12\.[0-9]\.[0-9] >/dev/null
+}
+
 checkout_and_patch_valgrind_variant() {
   # $1 = Valgrind-variant revision
   # $2 = source dir
@@ -165,6 +169,9 @@
       elif system_is_lion
       then
         build_valgrind "mac_10.7"
+      elif system_is_mountain_lion
+      then
+        build_valgrind "mac_10.7"
       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