Some cleanup in ecpg code:

Use bool as type for booleans instead of int.
Do not implicitely cast size_t to int.
Make the compiler stop complaining about unused variables by adding an empty statement.

src/interfaces/ecpg/ecpglib/extern.h

@@ -76,7 +76,7 @@ struct connection
 {
 	char	   *name;
 	PGconn	   *connection;
-	int			autocommit;
+	bool		autocommit;
 	struct ECPGtype_information_cache *cache_head;
 	struct prepared_statement *prep_stmts;
 	struct connection *next;