${GNU_ARCH_MACHINE}-netbsd. This allows platforms to that were
formerly a.out but ELF to be foo--netbsdelf. It also adds the
missing 2nd "-" which was missing in the former definition.
build in the middle and restarting on another platform (requiring atomic
host tool builds), and keep parallelism, the ".lo" rules can't be used
at all. Instead, compile all host .c files directly into executables.
This should not be used directly for building host tools; rather, the top
level bootstrap (to be committed separately) should be used to build the
entire system including this compiler.
thorpej