[MacPorts] #40501: Add btree_gist contrib module to Postgresql93

[MacPorts]

#40501: Add btree_gist contrib module to Postgresql93
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 Reporter:  dh@…    |      Owner:  macports-tickets@…
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.2.0
 Keywords:          |       Port:  postgresql93
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 This module is currently not among the contrib modules installed by
 default.  However it is often needed in order to use exclusion constraints
 in Postgresql (for example any EXCLUDE constraint involving an integer
 column).

 It should also be added to postgresql92/91/90.

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Ticket URL: <https://trac.macports.org/ticket/40501>
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