[PATCH] RISC-V: Use `as_fn_error' to report errors in `preconfigure'

[Andreas Schwab]

On Mai 12 2022, Maciej W. Rozycki wrote:

> Switch to using `as_fn_error' then as the fragment is sourced from the 
> main `configure' script and therefore the function can be used like in 
> other `preconfigure' fragments, so the message printed is such as:

I don't think we should use autoconf internals.

-- 
Andreas Schwab, schwab@linux-m68k.org
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