[PATCH 21/24] RISC-V sim: Fix mingw builds.

[Mike Frysinger]

On 17 Apr 2021 10:58, Jim Wilson wrote:
>  	  switch (cpu->a7)
>  	    {
> +#ifndef __MINGW32__

we def don't want to do it this way.  test for the func at configure time via
AC_CHECK_FUNCS_ONCE and then make the logic conditional upon it existing.
-mike