Fix declaration of isarray variable.

Found and fixed by Andres Freund.

src/interfaces/ecpg/ecpglib/execute.c

@@ -146,7 +146,7 @@ next_insert(char *text, int pos, bool questionmarks)
 }
 
 static bool
-ecpg_type_infocache_push(struct ECPGtype_information_cache ** cache, int oid, bool isarray, int lineno)
+ecpg_type_infocache_push(struct ECPGtype_information_cache ** cache, int oid, enum ARRAY_TYPE isarray, int lineno)
 {
 	struct ECPGtype_information_cache *new_entry
 	= (struct ECPGtype_information_cache *) ecpg_alloc(sizeof(struct ECPGtype_information_cache), lineno);

src/interfaces/ecpg/ecpglib/extern.h

@@ -44,7 +44,7 @@ struct ECPGtype_information_cache
 {
 	struct ECPGtype_information_cache *next;
 	int			oid;
-	bool		isarray;
+	enum ARRAY_TYPE	isarray;
 };
 
 /* structure to store one statement */