Both uclibc bits/ipc.h (this comes from uclibc) and the kernel

Both uclibc bits/ipc.h (this comes from uclibc) and the kernel
linux/posix_types.h define __kernel_key_t.  This means that an
app which includes both in one file will fail compilation.  The
patch fixes this by changing the typedef used inside bits/ipc.h
to the same one used in the glibc headers (identical to the type
from posix_types.h).  Unfortunately this means that any uclibc
only package which relied on this will now fail (but it would have
failed on glibc anyway), therefore this patch is made NSLU2
specific because it has only received complete testing on NSLU2.

This bug affects samba 3.0 builds on uclibc - without this fix
samba 3.0.x will not build on uclibc.

BKrev: 427fb232lDR4ZUgoXLYunOoObOvvyg