Fix header ordering for Mac OS X. #5187
Fix header ordering for Mac OS X. #5187

As we've seen before, header ordering can be quite tricky.  Attempt
to fix the build for Mac OS X without breaking others.

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor