Fix a few more generator scripts to produce pgindent-clean output.
This completes the project of making all our derived files be
pgindent-clean (or else explicitly excluded from indentation),
so that no surprises result when running pgindent in a built-out
development tree.
Discussion: https://postgr.es/m/
79ed5348-be7a-b647-dd40-
742207186a22@2ndquadrant.com