[PATCH] autofs4: header file update

The current header file definitions for autofs version 5 have caused a couple
of problems for application builds downstream.

This fixes the problem by separating the definitions.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>