Effectively revert revision 3.54's change to the definition of _md_iovector on all platforms except SYMBIAN, to fix bug 491441 on all platforms except Symbian.  Patch tested by timeless <timeless@bemail.org> (Thanks!).
Effectively revert revision 3.54's change to the definition of _md_iovector
on all platforms except SYMBIAN, to fix bug 491441 on all platforms except
Symbian.  Patch tested by timeless <timeless@bemail.org> (Thanks!).

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