This is the MinGW counterpart of -defarm64native.
When --native-def is not specified, pass the input def file as
-defarm64native on the ARM64X target as well. This reflects the most
common intent when providing a def file for ARM64X and, since the
regular def file is already passed as an input file, it feels consistent
to allow a proper build without requiring additional arguments. This can
be overridden by passing an empty value with --native-def= if using only
the EC def file is desired.
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