trim fs/internal.h

some stuff in there can actually become static; some belongs to pnode.h
as it's a private interface between namespace.c and pnode.c...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --cc fs/block_dev.c
Simple merge

diff --cc fs/exec.c
Simple merge

diff --cc fs/internal.h
Simple merge

diff --cc fs/pnode.h
Simple merge

diff --cc fs/super.c
Simple merge