pull in sys/sysmacros.h when available

This header provides major/minor/makedev funcs under most Linux C
libs.  Pull it in to fix building with newer versions that drop the
implicit include via sys/types.h.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94231


Signed-off-by: Mike Frysinger <vapier@gentoo.org>