Fix cross-version compatibility checks of pg_verify_checksums

Michael Paquier <michael@paquier.xyz>

Commit: 501f58359b59af1ffb58f9fbd6f97c4b226c69da
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-03-13T00:51:25Z
Releases: 11.3
Fix cross-version compatibility checks of pg_verify_checksums

pg_verify_checksums performs a read of the control file, and the data it
fetches should be from a data folder compatible with the major version
of Postgres the binary has been compiled with, but we never actually
checked that compatibility.

Reported-by: Sergei Kornilov
Author: Michael Paquier
Reviewed-by: Sergei Kornilov
Discussion: https://postgr.es/m/155231347133.16480.11453587097036807558.pgcf@coridan.postgresql.org
Backpatch-through: 11

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