Make compiler-generated vtable map variables global.

BUG=none
TEST=emerge-$board libchromeos
./build_image --board=$board test

Change-Id: I0cb65cc8c2071ac97769304df057e7bea9df3a9e
Reviewed-on: https://gerrit.chromium.org/gerrit/34129
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Caroline Tice <cmtice@chromium.org>
Commit-Ready: Caroline Tice <cmtice@chromium.org>
diff --git a/libpolicy.ver b/libpolicy.ver
index 8c01cdf..4acb71c 100644
--- a/libpolicy.ver
+++ b/libpolicy.ver
@@ -12,6 +12,7 @@
       policy::*;
       typeinfo*for*policy::*;
       vtable*for*policy*;
+      _VTV*::__vtable_map;
     };
 
   local: *;