riscv fenv.h: Make sure FE_* exception constants have type int.

This may not be formally required by the standard, but the values
must be representable by int since that's the type that functions
li

riscv fenv.h: Make sure FE_* exception constants have type int.

This may not be formally required by the standard, but the values
must be representable by int since that's the type that functions
like fetestexcept and feclearexcept traffic in. And this is less
work than changing all the printf %d users in tree.

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Use __BIT and fix FE_INEXACT

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provide a common softfloat fenv implemenation and use it for softfloat builds.
restore ABI compatibility with previous releases for ieeefp.h on sh3.
add namespace.h protection for all the fenv interf

provide a common softfloat fenv implemenation and use it for softfloat builds.
restore ABI compatibility with previous releases for ieeefp.h on sh3.
add namespace.h protection for all the fenv interfaces.
use MKSOFTFLOAT on sh3 instead of assuming softfloat.
standardize on comparing MKSOFTFLOAT with "no".
remove the arm-specific softfloat fenv code (which also had several bugs).
fix logic errors in the arm hardfloat feraiseexcept() and feupdateenv().

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New files for Userland support of UCB RISC-V (both 32-bit and 64-bit)