Remove vcruntime._Private.xstddef
#67821
Merged
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<xstddef>
was removed since MSVC 14.37 (see microsoft/STL#3654). It isn't meant to be used by most users, but the reference will break all clients ofvcruntime
, including Swift standard library itself.An alternative is to provide an empty
xstddef
file through VFS overlay, which doesn't seem a reasonable workaround for private stubs.