[riscv-port] RFR: 8283020: riscv: Fix configure integration

[Feilong Jiang]

On Fri, 11 Mar 2022 11:16:01 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> The current implementation in the riscv-port modifies make/autoconf/build-aux/autoconf-* files. For legal reasons, this is not something that is allowed. Instead, we need to introduce patches in our wrapper scripts in the same directory.
> 
> This patch will restore the original contents of the autoconf-* files, and instead move this logic to the wrapper scripts. 
> 
> This PR also fixes an indentation problem in configure.
> 
> I have not been able to verify this patch, since I do not have access to riscv hardware. I believe it is sufficient and correct, but it might be the case that config.sub also needs updating. I kindly request assistance in verifying this.
> 
> (Apart from these fixes, all build changes in the riscv-port looks good to me)

Marked as reviewed by fjiang (Author).

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PR: https://git.openjdk.java.net/riscv-port/pull/66