Add missed files

pgxn/neon/neon--1.4--1.5.sql

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+\echo Use "ALTER EXTENSION neon UPDATE TO '1.5'" to load this file. \quit
+
+-- returns minimal LFC cache size (in 8kb pages) provided specified hit rate
+CREATE FUNCTION approximate_optimal_cache_size(duration_sec integer default null, min_hit_ration float8 default null)
+RETURNS integer
+AS 'MODULE_PATHNAME', 'approximate_optimal_cache_size'
+LANGUAGE C PARALLEL SAFE;
+
+GRANT EXECUTE ON FUNCTION approximate_optimal_cache_size(integer,float8) TO pg_monitor;
+

pgxn/neon/neon--1.5--1.4.sql

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+DROP FUNCTION IF EXISTS approximate_optimal_cache_size(integer,float8) CASCADE;