This should fix linker error when building with clang+lld.
- rS357170: Build hard-float lib32 for mips64hf/mips64elhf
lib32 now builds with -mhard-float instead of -msoft-float
Yes, I was testing this locally, though without the :=, just a plain =. I was testing it as part of a make tinderbox run though that is only on amd64 and hasn't gotten to mips, so hadn't seen breakage that would require :=.