Require a semicolon after package-scoped event triggers

The package-scoped event trigger production does not consume its trailing
semicolon. As a result, `if (cond) -> p::e; else ...` is rejected because
the semicolon is parsed as a separate null statement. Omitting the
required semicolon incorrectly makes the statement compile.

Add the semicolon to the package production, matching the ordinary event
trigger and the `event_trigger` grammar in IEEE 1800-2023 A.6.5.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

Author: larsclausen

parse.y

@@ -7719,7 +7719,7 @@ non_block_statement_item
 	delete $2;
 	$$ = tmp;
       }
-  | K_TRIGGER package_scope hierarchy_identifier
+  | K_TRIGGER package_scope hierarchy_identifier ';'
       { lex_in_package_scope(0);
 	PTrigger*tmp = pform_new_trigger(@3, $2, *$3);
 	delete $3;