private NSPR headers (prosdep.h and primpl.h) from the Mozilla source.
The part of prosdep.h that is actually needed by Mozilla was extracted
and put in the new file mozilla/include/xp_path.h.
git-svn-id: svn://10.0.0.236/trunk@10691 18797224-902f-48f8-a5cc-f745e15eee43
