Remove need for shared library PostgreSQL functions

This is no longer needed as of PR
openstreetmap#2383

docker/postgres/Dockerfile

@@ -1,25 +1,4 @@
 FROM postgres:11
 
-RUN apt-get update && \
-    apt-get install -y \
-      build-essential \
-      curl \
-      postgresql-server-dev-all && \
-    apt-get clean && \
-    rm -rf /var/lib/apt/lists/*
-
-# Setup app location
-RUN mkdir -p /app
-WORKDIR /app
-
-# Add custom database functions
-ADD db/functions/ /app/db/functions/
-
-# Get quad_tile.h header file from quad_tile repository and
-# use it to make libpgosm.so for OSM-specific Postgres functions.
-RUN cd db/functions && \
-    curl -# -O https://raw.githubusercontent.com/openstreetmap/quad_tile/9fcba83fcbca8a206fa518da5a52f840dc2ecb09/ext/quad_tile/quad_tile.h && \
-    make -e QTDIR=/app/db/functions libpgosm.so
-
-# Add db init script to install OSM-specific Postgres functions
+# Add db init script to install OSM-specific Postgres functions/extensions.
 ADD docker/postgres/openstreetmap-postgres-init.sh /docker-entrypoint-initdb.d/

docker/postgres/openstreetmap-postgres-init.sh

@@ -2,6 +2,3 @@
 set -e
 
 psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE EXTENSION btree_gist" openstreetmap
-psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE FUNCTION maptile_for_point(int8, int8, int4) RETURNS int4 AS '/app/db/functions/libpgosm', 'maptile_for_point' LANGUAGE C STRICT" openstreetmap
-psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE FUNCTION tile_for_point(int4, int4) RETURNS int8 AS '/app/db/functions/libpgosm', 'tile_for_point' LANGUAGE C STRICT" openstreetmap
-psql -v ON_ERROR_STOP=1 -U "$POSTGRES_USER" -c "CREATE FUNCTION xid_to_int4(xid) RETURNS int4 AS '/app/db/functions/libpgosm', 'xid_to_int4' LANGUAGE C STRICT" openstreetmap