Fix build for O32 systems without a TARGET_CPUTYPE defined.  We must default to MIPS-III because FreeBSD relies on a number of MIPS-III features; the ABI default would be MIPS-I which we don't intend to support.  Our old default before I switched to using the ABI default was MIPS32.
Fix build for O32 systems without a TARGET_CPUTYPE defined.  We must default to
MIPS-III because FreeBSD relies on a number of MIPS-III features; the ABI
default would be MIPS-I which we don't intend to support.  Our old default
before I switched to using the ABI default was MIPS32.

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