understand what it is trying to do, but I suspect it's not doing
it.
* config/ns32k/merlin.mh: Add comment about M_INSTALL.
* config/m88k/{delta88.mh,delta88v4.mh}: Remove M_INSTALL and
M_UNINSTALL; it tries to install a non-existent file gdb.z.
* Makefile.in: Remove M_INSTALL stuff; the above were the only uses.
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.