busybox

mkdir: fix permissions on 64-bit platforms

sizeof(long) != sizeof(mode_t), this causes the compare in
bb_make_directory of (long)-1 != (mode_t)-1 to fail and mess up
the permissions of final directory by doing chmod((mode_t) -1).

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>