Move device number printing code into a separate routine

Move device number printing code into a separate routine

* print_dev_t.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (print_dev_t): New prototype.
* dm.c: Do not include <sys/sysmacros.h>.
(dm_decode_device, dm_print_dev, dm_decode_dm_name_list): Use
print_dev_t function for printing device numbers.
* mknod.c: Do not include <sys/sysmacros.h>.
(decode_mknod): Use print_dev_t function for printing device number.
* print_struct_stat.c: Do not include <sys/sysmacros.h>.
(print_struct_stat): Use print_dev_t function for printing device
numbers.

Co-authored-by: Dmitry V. Levin <ldv@altlinux.org>