Decided not to make the thread functions report errors to the testingT object; I'm still not a big fan of the thread model here, but I'd like to actually split the thread functions out of the testing library entirely, since they are only used for the tests in initmain.c.

test/testing_windows.c

@@ -438,7 +438,6 @@ static unsigned __stdcall threadThreadProc(void *data)
 	return 0;
 }
 
-// TODO instead of panicking, should these functions report errors to a testingT?
 testingThread *testingNewThread(void (*f)(void *data), void *data)
 {
 	testingThread *t;