tools/include: use stdint types for user-space byteshift headers

Commit a07f7672 added user-space copies
of the byteshift headers to be used by hostprogs, changing e.g. u8 to __u8.
However, in order to cross-compile the kernel from a non-Linux system,
stdint.h types need to be used instead of linux/types.h types.

Change-Id: I72632acb8fd44d671098c4e680c99fa76b214b27
Signed-off-by: Yaakov Selkowitz <yselkowitz@users.sourceforge.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>
(cherry picked from commit d7e0ebf732777064d9069b5e789b142a65a5868e)