Added crypto library to update_engine -l list so that it is explicitly passed to the linker.
Without this, the package won't link with the gold linker. This is not a gold bug.

Change-Id: If52f8ba2630f017e9482de1cdd9c9f34a54e8ffe

BUG=
TEST=

Review URL: http://codereview.chromium.org/3450005
diff --git a/SConstruct b/SConstruct
index 09a6566..a9bf9eb 100644
--- a/SConstruct
+++ b/SConstruct
@@ -157,6 +157,7 @@
 
 env['LIBS'] = Split("""base
                        bz2
+                       crypto
                        curl
                        gflags
                        glib-2.0