[Bug 44948] Spine (Mod starter for Gothic) needs CreateSymbolicLinkW implementation

https://bugs.winehq.org/show_bug.cgi?id=44948

--- Comment #15 from Screwtape  ---
"mklink /d b/b ../a/a" does not work on Real Windows because it mistakes the
paths for switches. "mklink /d b\b ..\a\a" works as expected.

With this implementation, "mklink /d b\b a\a" creates test\b\b which is a
symlink to test\a\a, but on Windows that command creates a symlink that points
to test\b\a\a. Which is to say, on both Windows and POSIX, if a symlink is
created with a relative target path, the target path is relative to the
symlink's own path, not the current working directory of the process that
created the symlink.