Fix [-Wimplicit-fallthrough] warnings in SOAP extension

Author: Girgias

ext/soap/php_encoding.c

@@ -1766,6 +1766,8 @@ static sdlTypePtr model_array_element(sdlContentModelPtr model)
 				return model_array_element(tmp);
 			} ZEND_HASH_FOREACH_END();
 		}
+		/* TODO Check this is correct */
+		fallthrough;
 		case XSD_CONTENT_GROUP: {
 			return model_array_element(model->u.group->model);
 		}

ext/soap/php_schema.c

@@ -2207,6 +2207,7 @@ static void schema_content_model_fixup(sdlCtx *ctx, sdlContentModelPtr model)
 				model->max_occurs = 1;
 			}
 		}
+		fallthrough;
 		case XSD_CONTENT_SEQUENCE:
 		case XSD_CONTENT_ALL: {
 			sdlContentModelPtr tmp;