- Don't create pipeEndProcDetect on Darwin
- Initialize the wxEndProcessData before installing the callback
- Implement wxAddProcessCallbackForPid for Darwin, the code started life
as an example from ADC and certainly has its fair share of race
conditions, but with a few hacks it seems to be working okay.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19811 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775