WinUpdater: Defer modifying any files until Updater.exe #11189
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Fixes https://bugs.dolphin-emu.org/issues/12151
IMO better way to fix the issue than #10990
I (hopefully) haven't modified the logic at all on macos - I'm not sure if it should be or not.
The core of the problem was that
File::Copy(updater_path, reloc_updater_path);was failing silently. This is actually a pervasive problem in dolphin: many uses of filesystem-related Common functions have no error handling by their callers. I tried adding[[nodiscard]]to funcs in FileUtil but fixing such issues quickly became a large change that I'm not necessarily concerned with at the moment (maybe someone else wants to do it?). For instance, the macos path usesFile::CopyDirin here and that func doesn't even return success indication at all (and the chmod result isn't checked, etc...).