* dst.h, dstread.c, config/m68k/{apollo68b.mt,tm-apollo68b.h}:
New files.
* config/m68k/nm-apollo68b.h: Add more defines.
* configure.in: Recognize apollo target, not just host.
config files moved to an appropriate config/<cpu> subdirectory.
* nm-*, xm-*, tm-*: All native, host, and target files, which
get linked to nm.h, xm.h, and tm.h respectively by configure,
moved to appropriate config/<cpu> subdirectory.