[PATCH] ipmi: allow userland to include ipmi.h

The IPMI driver include file needs to include compiler.h so it has definitions
for __user and such.

Signed-off-by: Corey Minyard <minyard@acm.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>