RFR: 8351323: Parameterize compiler and linker flags for iconv

[snake66]

On Wed, 12 Mar 2025 12:15:18 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> > Another way to phrase this is perhaps: "why don't we need iconv on linux?"
> 
> I googled this and can answer it myself: because `iconv()` is built into glibc. 

Yes, that's what I came to as well. Sorry I didn't include that info in the original description. It seems to be even more complicated on some platforms, where there _is_ built in support for iconv (or a system supplied libiconv), but with limitations so that you may want to prefer the GNU libiconv in any case.

I think we should be able to configure these cases properly also with the proposed changes.

I'll update the PR as outlined in the previous comments.

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PR Comment: https://git.openjdk.org/jdk/pull/23995#issuecomment-2717713872