[Tile-serving] [openstreetmap/osm2pgsql] Remove IMMUTABLE volatility classification from trigger function (#1542)

[Jochen Topf]

It is not clear how exactly the volatility classification works in
trigger functions, so it is better to be on the safe side here and not
declare the function IMMUTABLE (which makes it the default VOLATILE
instead).

https://www.postgresql.org/docs/current/xfunc-volatility.html
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1542

-- Commit Summary --

  * Remove IMMUTABLE volatility classification from trigger function

-- File Changes --

    M src/pgsql-helper.cpp (2)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1542.patch
https://github.com/openstreetmap/osm2pgsql/pull/1542.diff

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