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

[d-bugmail at puremagic.com]

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

--- Comment #4 from Basile-z <b2.temp at gmx.com> ---
also no reason to target stable(In reply to Basile-z from comment #3)
> 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.

sorry about that comment, as explained here
https://issues.dlang.org/show_bug.cgi?id=3251, that is not required.

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