An option to run openjdk with rvv 0.7.1

[Vladimir Kempik]

Hello

I have created a version of openjdk21u with support for RVV version 0.7.1 [1].
it’s mostly useful to check some rvv intrinsics performance on licheepi 4a board.

Regards.

[1] - https://github.com/syntacore/syntaj21/tree/rvv0.7.1