include sys/sysmacros.h as needed

include sys/sysmacros.h as needed

The minor/major/makedev macros are not entirely standard.  glibc has had
the definitions in sys/sysmacros.h since the start, and wants to move away
from always defining them implicitly via sys/types.h (as this pollutes the
namespace in violation of POSIX).  Other C libraries have already dropped
them.  Since the configure script already checks for this header, use that
to pull in the header in files that use these macros.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>