RFR: 8341586: RISC-V: build fail with gcc9

[SendaoYan]

On Tue, 8 Oct 2024 13:45:02 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> gcc 9 is not supported for mainline. If this is required for 21 and older, it should go in there and then be backported from there. I do not think this PR should be included in mainline.
> 
> Please open a separate JBS issue for the incorrect detection of gcc version by configure.

Okey.

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PR Comment: https://git.openjdk.org/jdk/pull/21376#issuecomment-2400329335