- don't include eeprom support on sparc64.
- work out if we are eeprom or openprom from the results of open()
and/or ioctl(), rather than grovelling the kernel.
- move all eeprom specific code to eehandlers.c
- update manpage for sparc64 usage, remove delete -N switch
with these changes, eeprom(8) no longer needs to be setgid.
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