dev_install: use a relative libdir symlink

This way the symlink is valid when the dir is mounted elsewhere.

BUG=chromium:462099
TEST=precq passes

Change-Id: I77e69b2758648c48f5b36ec67783a44faa2bee1a
Reviewed-on: https://chromium-review.googlesource.com/272733
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/dev-install/dev_install b/dev-install/dev_install
index c2a5f22..e1838b4 100755
--- a/dev-install/dev_install
+++ b/dev-install/dev_install
@@ -270,7 +270,7 @@
   # TODO(sosa): Remove hack once lib dependencies are sorted in R27.
   if [ ! -d /usr/local/lib64 ]; then
     mkdir -p /usr/local/lib
-    ln -s /usr/local/lib /usr/local/lib64
+    ln -s lib /usr/local/lib64
   fi
 
   # Set up symlinks for etc/{group,passwd}, so that packages can look up users