[Issue 23906] Unicode file names are not properly handled

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23906

--- Comment #2 from kinke <kinke at gmx.net> ---
[Oh, switching to wmain() shouldn't be required; _d_run_main in druntime
ignores the narrow cmdline args anyway and properly converts the UTF16 ones to
UTF8 for _Dmain.]

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