Firefox 3.5: Mutex init failure: Invalid argument

[Greg Rivers]

The new www/firefox35 port builds fine on both 7.2-STABLE and 8.0-CURRENT 
(i386), but seg faults upon execution:

$ firefox3 -v
Mozilla Firefox 3.5, Copyright (c) 1998 - 2009 mozilla.org
$ firefox3 -safe-mode
Mutex init failure: Invalid argument
Segmentation fault
$ firefox3
Mutex init failure: Invalid argument
Segmentation fault

It runs ok with command line options -v or -h, but seg faults otherwise; 
it does not leave a core file.  The result is the same with or without 
OPTIMIZED_CFLAGS, and with or without the sem(4) kernel module loaded.  I 
tried moving ~/.mozilla out of the way temporarily, but that doesn't help 
either.

-- 
Greg Rivers