Fix #90: Remove unused FP static symbols on x86
We no longer support x87, so the static symbols for the long float
constants aren't used anymore. And we don't use *fp-constant-1d0*
anywhere, so we can remove the constants for 1f0 and 1d0.
Also *fp-constant-0s0*
is misnamed. Change the name to *fp-constant-0f0*
.