Remove unimplemented/undocumented geometric functions & operators.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 189699dd3680d85c74c3886b33d9a9f83301defd
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-12-13T23:08:28Z
Releases: 15.0
Remove unimplemented/undocumented geometric functions & operators.

Nobody has filled in these stubs for upwards of twenty years,
so it's time to drop the idea that they might get implemented
any day now.  The associated pg_operator and pg_proc entries
are just confusing wastes of space.

Per complaint from Anton Voloshin.

Discussion: https://postgr.es/m/3426566.1638832718@sss.pgh.pa.us

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