refactor: hemar reboot

package/c/hemar-legacy/postgreact--1.0.sql

@@ -0,0 +1,12 @@
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION postgreact" to load this file. \quit
+
+-- Define the hello function that uses our C implementation
+CREATE FUNCTION hello()
+RETURNS
+  TEXT
+STRICT VOLATILE
+LANGUAGE C
+AS
+  'MODULE_PATHNAME', 'hello'
+;