RFR: 8323672: Suppress unwanted autoconf added flags in CC and CXX [v7]

[Magnus Ihse Bursie]

On Thu, 18 Jan 2024 16:21:46 GMT, Julian Waters <jwaters at openjdk.org> wrote:

>> [JDK-8323008](https://bugs.openjdk.org/browse/JDK-8323008) reports unwanted autoconf flags being added to the command line, and solves the issue by filtering out the added flags by force. This is not optimal however, as doing so leaves the autoconf message that the flags were added still displaying during the configure process, which is confusing. Instead, setting a couple of fields to disable the autoconf internals responsible for the unwanted flag is a cleaner solution
>
> Julian Waters has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Implement custom AC_PROG_CC and AC_PROG_CXX in util.m4

Keep it for a while more, bot. I'll try to some testing of this on 2.69 and 2.70 if Julian is unable to.

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PR Comment: https://git.openjdk.org/jdk/pull/17401#issuecomment-2296693414