Use variables, defined in the configure to define edition and productname entities

Author: vbwagner

doc/src/sgml/Makefile

@@ -103,6 +103,7 @@ version.sgml: $(top_srcdir)/configure
 	  echo "<!ENTITY version \"$(PGPRO_VERSION)\">"; \
 	  echo "<!ENTITY majorversion \"$(MAJORVERSION)\">"; \
 	  echo "<!ENTITY productname \"$(PRODUCT_NAME)\">"; \
+	  echo "<!ENTITY edition \"$(PGPRO_EDITION)\">"; \
 	} > $@
 
 features-supported.sgml: $(top_srcdir)/src/backend/catalog/sql_feature_packages.txt $(top_srcdir)/src/backend/catalog/sql_features.txt