[Issue 21605] Instead of giving error on printf format mismatch, correct it

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21605

Mathias LANG <pro.mathias.lang at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |pro.mathias.lang at gmail.com

--- Comment #1 from Mathias LANG <pro.mathias.lang at gmail.com> ---
That sounds like a lot of magic for `printf`. What's the advantage over using,
say, `writeln` ? And if it's only `-betterC` then it's rather simple to provide
a library implementation that calls `printf` under the hood, no need to add
this in the compiler.

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