RFR: 8350801: Add a code signing hook to the JDK build system

[Thomas Stuefe]

On Mon, 24 Mar 2025 17:47:07 GMT, Frederic Thevenet <fthevenet at openjdk.org> wrote:

> > Tested on Mac OS. Works, see [build.log](https://github.com/user-attachments/files/19428633/build.log)
> > Improvement possible:
> > ```
> > * signing script has to be executable
> > ```
> 
> I've extend the `UTIL_ARG_WITH` macro with a new type to check that the provided argument is indeed an existing file with execute access under the current context, so now `configure` should fail if a non executable script is provided.

Why not just call bash with the script as argument? Or is this against some policy or good style?

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PR Comment: https://git.openjdk.org/jdk/pull/23807#issuecomment-2750525267