[Libsigcx-main] Event handling fixes

[Steven B. <sw...@uc...>]

There were some errors with how libsigcx handles events - the attached 
patch fixes them.  Here's the changelog entry from the attached patch:

         * sigcx/dispatch.cc, sigcx/dispatch.h: Fix iterator corruption
         and calling removed handlers when removing event handlers from
         event handlers, and fix not select()ing on the first pass on
         file event handlers added from event handlers on the same pass.

With these patches and the current arch tree, my stuff is working quite 
well.  It'd be great if a 0.6.5 could be rolled from the arch tree after 
this is applied.  If it's a time issue for you, I could see about 
rolling one for you.