* iconvdata/Makefile (modules): Add ISO_10367-BOX, MAC-IS, NATS-DANO,
and NATS-SEFI.
Define *-routines variables for new modules.
(distribute): Add .c files for new modules.
(awk-generated-headers): Add iso_10367-box.h, mac-is.h, nats-dano.h,
and nats-sefi.h.
Add rules for header generation.
* iconvdata/gconv-modules: Add entries for new modules.
* iconvdata/iso_10367-box.c: New file.
* iconvdata/mac-is.c: New file.
* iconvdata/nats-dano.c: New file.
* iconvdata/nats-sefi.c: New file.
Add rules for header generation.
