* emulparams/elf32bmipn32-defs.sh: Set ELFSIZE according to

* emulparams/elf32bmipn32-defs.sh: Set ELFSIZE according to
emulation name.  Set LIB_PATH only for native tools, and
search the ABI-specific versions of NATIVE_LIB_DIRS before the
.../lib variants, not instead of them.  Mostly copied from...
* emulparams/elf32ppc.sh: ... here.  Fixed typo.
* emulparams/elf64bmip-defs.sh: Backed out.
* emulparams/elf64bmip.sh: Import elf32bmipn32-defs.sh again.
* emulparams/elf64btsmip.sh: Likewise.
(DATA_ADDR, NONPAGED_TEXT_START_ADDR, SHLIB_TEXT_START_ADDR,
TEXT_DYNAMIC): Removed.