Remove trailing commas in enums.

These aren't valid C89. Found thanks to gcc's -Wc90-c99-compat. These
exist in differing places in most supported branches.

src/include/catalog/objectaccess.h

@@ -27,7 +27,7 @@
 typedef enum ObjectAccessType
 {
 	OAT_POST_CREATE,
-	OAT_DROP,
+	OAT_DROP
 } ObjectAccessType;
 
 /*

src/include/pgstat.h

@@ -637,7 +637,7 @@ typedef enum BackendState
 	STATE_IDLEINTRANSACTION,
 	STATE_FASTPATH,
 	STATE_IDLEINTRANSACTION_ABORTED,
-	STATE_DISABLED,
+	STATE_DISABLED
 } BackendState;
 
 /* ----------