Add a CFLG_OBSOLETE flag, and handle it at the confvar layer
Follow up to #32295 (moved) for 0.4.3.
nickm says:
My suggestion would be to change how OBSOLETE is implemented: it doesn't really make sense as a type. Instead, there should be an "empty" type for fields that can't be read or written, and a CFLG_OBSOLETE flag that causes these warnings. The CFLG_OBSOLETE flag should be handled at the confvar layer, I think.
This is a bug caused by sponsor 31, so it's a must-have.
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