The emalloc set of error-checking memory allocation routines were added
to libnetbsd in r316572. Use them in makefs to reduce differences with
NetBSD.
NetBSD revs:
cd9660.c 1.39
ffs.c 1.56
makefs.c 1.42
walk.c 1.27
cd9660/cd9660_archimedes.c 1.2
cd9660/cd9660_eltorito.c 1.20
cd9660/cd9660_write.c 1.16
cd9660/iso9660_rrip.c 1.12
ffs/buf.c 1.17
ffs/mkfs.c 1.26
Obtained from: NetBSD
depend on namespace pollution and as such become more portable. This
means including headers like <sys/types.h> or <stdlib.h>, but also
making sure we include system/host headers before local headers.
While here: define ENOATTR as ENOMSG in mtree.c. There is no ENOATTR
on Linux.
With this, makefs is ready for compilation on macOS and Linux.