Fix memory leak when output postgres_fdw's "Relations"

[Ranier Vilela]

Hi,

This is a minor leak, oversight in
https://github.com/postgres/postgres/commit/4526951d564a7eed512b4a0ac3b5893e0a115690#diff-e399f5c029192320f310a79f18c20fb18c8e916fee993237f6f82f05dad851c5

ExplainPropertyText does not save the *relations->data* pointer and
var relations goes out of scope.

No need to backpatch.

regards,
Ranier Vilela

fix_memory_leak_postgres_fdw.patch
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