Fix the build on OS X 10.8.0
authorPaul Khuong <pvk@pvk.ca>
Sat, 20 Apr 2013 11:43:00 +0000 (13:43 +0200)
committerPaul Khuong <pvk@pvk.ca>
Sat, 20 Apr 2013 11:58:13 +0000 (13:58 +0200)
It seems our exception handler can be called before it's fully set up.
Handle that case without potentially leaking too many ports.

Reported by Gabriel Dos Reis on sbcl-devel.


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