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

src/bin/pg_verify_checksums/pg_verify_checksums.c

@@ -316,6 +316,13 @@ main(int argc, char *argv[])
 		exit(1);
 	}
 
+	if (ControlFile->pg_control_version != PG_CONTROL_VERSION)
+	{
+		fprintf(stderr, _("%s: cluster is not compatible with this version of pg_verify_checksums\n"),
+				progname);
+		exit(1);
+	}
+
 	if (ControlFile->state != DB_SHUTDOWNED &&
 		ControlFile->state != DB_SHUTDOWNED_IN_RECOVERY)
 	{