com32/modules: Add c32box.c; will FTBFS

SliTaz's md5sum.c as c32box.c.  Uses protected com32 symbols and
will fail to build from source.

http://hg.slitaz.org/wok/file/3f48e3a93cd7/syslinux/stuff/extra/md5sum.c
http://hg.slitaz.org/wok/log/default/syslinux/stuff/extra/md5sum.c

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
c32box.c: Use gpllib's detect_memsize()

Eliminates the FTBFS

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
c32box: move say

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
c32box.c: use libutil md5

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
c32box: rename main_kbdmap() to main_kbdmap_cpio()

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
c32box: only unrockridge filenames if ISOLINUX

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>
com32/modules/Makefile: add c32box.c32

Signed-off-by: Gene Cumm <gene.cumm@gmail.com>