[Issue 22549] importC: float literal should support leading zero

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22549

Basile-z <b2.temp at gmx.com> changed:

           What    |Removed                     |Added
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                 CC|                            |b2.temp at gmx.com

--- Comment #3 from Basile-z <b2.temp at gmx.com> ---
the fix affects the specs https://dlang.org/spec/lex.html#LeadingDecimal, hence
everything that would be based on them.

I suggest to only allow leading zeroes in importC mode.

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