Remove comment header from generated output of Build.ConfigHeader

[g012]

Zig Version

0.12.0-dev.3161+377ecc6af

Steps to Reproduce and Observed Behavior

When using b.addConfigHeader() in build.zig, a C or ASM comment is forcefully prepended in the generated output file ; from ConfigHeader.zig:

    const header_text = "This file was generated by ConfigHeader using the Zig Build System.";
    const c_generated_line = "/* " ++ header_text ++ " */\n";
    const asm_generated_line = "; " ++ header_text ++ "\n";
...
            try output.appendSlice(c_generated_line);

I use ConfigHeader with an existing lua.in file to generate a Lua file, as I'm migrating from CMake to build.zig, and in Lua /* */ or ; comments are invalid. Can you add an option to customize and remove this automatically added comment ?

Expected Behavior

I would like no extra text added to the generated file of ConfigHeader.

[g012]

Real-world example here: https://github.com/g012/l65/blob/master/build.zig

[andrewrk]

Sure, go ahead and add the option. This is a contributor-friendly enhancement.

[Lking03x]

@andrewrk
#20018
This should solve the issue. It implements some suggestions from #19277 (review)