* emulparams/elf32bmipn32-defs.sh (LIB_PATH): Set to /usr/lib32.

* emulparams/elf32bmipn32-defs.sh (LIB_PATH): Set to /usr/lib32.
(GENERATE_SHLIB_SCRIPT): Set to yes.
(EXECUTABLE_SYMBOLS, WRITABLE_RODATA): Moved to...
* emulparams/elf32bmipn32.sh: here.
(GENERATE_SHLIB_SCRIPT): Deleted as redundant.
* emulparams/elf32btsmipn32.sh: Delete redundant unsets.
* emulparams/elf64bmip-defs.sh: New file.  Extend
elf32bmipn32-defs.sh by overiding ELFSIZE and LIB_PATH.
* emulparams/elf64bmip.sh: Bring in definitions from
elf64bmip-defs.sh.
(ELFSIZE, GENERATE_SHLIB_SCRIPT, LIB_PATH): Delete redundant
settings.
(WRITABLE_RODATA): Moved from elf32bmipn32-defs.sh.
* emulparams/elf64btsmip.sh: Bring in definitions from
elf64bmip-defs.sh.
(ELFSIZE, GENERATE_SHLIB_SCRIPT): Delete, redundant.
(EXECUTABLE_SYMBOLS, WRITABLE_RODATA): Delete redundant unsets.