McLachlan has incorrect READ declarations for presync

[rhaas80]

ET issue https://bitbucket.org/einsteintoolkit/tickets/issues/2526/mclachlan-has-incorrect-read-declarations describes an issue observed in McLachlan. However this is ultimately due to a problem in Kranc.

Pull request #155 proposes a fix.

Could the be included in Kranc (shortly) after the 2023_05 release, please?

[rhaas80]

@ianhinder @eschnett could one of you review this? It is a Kranc issue and qualified reviewers are very rare :-)