Revert "std.Target: xtensa defaults to windowed ABI"

This reverts commit c55e83eab1369373fe6db5072802c2fc1c4d7ebc.

This was a misreading of XtensaFeatures.td on my part.
9161923405Alex Rønne Petersen committed on 10/27/2025, 5:09:33 AMparent6b4f57a
1 file changedLine totals unavailable