softfloat: float*_to_int32_round_to_zero: don't assume int32 is 32 bits

softfloat: float*_to_int32_round_to_zero: don't assume int32 is 32 bits

Code in the float64_to_int32_round_to_zero() function was assuming
that int32 would not be wider than 32 bits; this meant it might
not correctly detect the overflow case. We take the simple approach
of using int32_t. Also fix equivalent issues in the functions
for other float sizes.

Signed-off-by: Peter Maydell <[email protected]>
Signed-off-by: Blue Swirl <[email protected]>