Bugzilla bug #5518: map PRSeekWhence to FILE_XXX before passing to SetFilePointer. Bugzilla bug #5520: correctly check for failure status of SetFilePointer when invoked with a non-NULL third argument.
Bugzilla bug #5518: map PRSeekWhence to FILE_XXX before passing to
SetFilePointer.
Bugzilla bug #5520: correctly check for failure status of SetFilePointer
when invoked with a non-NULL third argument.

thespooler/nspr,thespooler/nspr,thespooler/nspr,thespooler/nspr,thespooler/nspr