1988 called; it wants its pre-standard version of C back. As the
comment in vfprintf.c said, "Stock 4.3 doesn't have vfprintf."; it's
been a while since 4.3BSD was the latest shiniest BSD-flavored OS.
Instead, use compiler test macros to check whether *particular*
attributes are supported, and set various #defines appropriately, in
header files.
Rename the UNALIGNED structure attribute to ND_UNALIGNED, and ask
whether we still need it.
