Correct constness of a few variables.

Andres Freund <andres@anarazel.de>

Commit: 62649bad831fb69b5d9644470acc413a35cddea6
Author: Andres Freund <andres@anarazel.de>
Date: 2018-10-16T04:01:14Z
Releases: 12.0
Correct constness of a few variables.

This allows the compiler / linker to mark affected pages as read-only.

There's other cases, but they're a bit more invasive, and should go
through some review. These are easy.

They were found with
objdump -j .data -t src/backend/postgres|awk '{print $4, $5, $6}'|sort -r|less

Discussion: https://postgr.es/m/20181015200754.7y7zfuzsoux2c4ya@alap3.anarazel.de

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