[Issue 23508] Unable to build japanese named source files

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23508

--- Comment #5 from FeepingCreature <default_357-line at yahoo.de> ---
The relevant code seems to be compiler/src/dmd/common/string.d:122, which
converts a D string (UTF-8) to the "system default Windows ANSI code page"
(CP_ACP). This then gets passed to GetFileAttributesW to check that the file
exists. (file_manager.d:51) Maybe throw a printf in there to see what it does?

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