Change floating-point mode/environment control functions to operate on
both the hardfloat (FPU registers) and softfloat (software) state. This
makes these functions work correctly when mixing hardfloat and softfloat
code. Disable trapping for softfloat since most (if not all) ARMv7 and
ARMv8 hardware that is on the market doesn't support trapping of
floating-point exceptions.

ok patrick@