Move RLIMIT constants to OS/ISA specific files instead of generic OS container classes

Move RLIMIT constants to OS/ISA specific files instead of generic OS container classes
Update MIPS/Linux constants

arch/alpha/linux/linux.hh:
    move RLIMIT constants to ALPHA/Linux class
arch/alpha/tru64/tru64.hh:
    move RLIMIT constants to ALPHA/Tru64 class
arch/mips/mips_linux.hh:
    update MIPS constants for MIPS/Linux
kern/linux/linux.hh:
    remove RLIMIT constants from generic Linux class... these are now in ISA specific / OS specific classes
kern/tru64/tru64.hh:
    remove RLIMIT constants from generic Tru64 class... these are now in ISA specific / OS specific classes

--HG--
extra : convert_revision : 2e2743d73ab18fcd558a5765cb4ef0e9671bd1d7