[patch][dragoneeg] Don't try to emit a weakref twice with gcc 4.8

[Rafael Espíndola]

Hi Duncan,

I was trying to reproduce the recent dragonegg buildbot failures:

http://lab.llvm.org:8011/builders/dragonegg-x86_64-linux-gcc-4.6-self-host-debug/builds/4500

Unfortunately the those tests just pass locally for me with gcc 4.6
and 4.7. I did find an unrelated issue with 4.8: we were trying to
output weakrefs twice. The attached patch fixes that.

Cheers,
Rafael
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