[Bug 39244] scrrun:filesystem BOM tests fail in the Korean and Chinese locales

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=39244

--- Comment #5 from Robert Wilhelm  ---
I plan to submit fixes for tests once my current patch
https://source.winehq.org/patches/data/220837 is accepted.

filesystem.c:1529 could use same method as in this patch using ReadFile() to
check contents of file.

For 
filesystem.c:1658: Test failed: got L"\f8f5\fa0f", 93
filesystem.c:1802: Test failed: got L"\f8f5\fa0f", expected L"\f8f5?"
we have to take chars after BOM into account, because 0xfe is LeadByte in zh_CN
locale.