Make the definition for float_const() match the prototype
Make the definition for float_const() match the prototype

The definition for float_const() had int32_t, the prototype had only
int.  We only care about the sign, so int makes more sense.

letolabs/nasm,Distrotech/nasm,Distrotech/nasm,Distrotech/nasm,techkey/nasm,projedi/nasm,letolabs/nasm,Distrotech/nasm,techkey/nasm,techkey/nasm,techkey/nasm,projedi/nasm,projedi/nasm,projedi/nasm,letolabs/nasm,projedi/nasm,turingstudio/nasm,techkey/nasm,turingstudio/nasm,turingstudio/nasm,turingstudio/nasm