build: install the GTK module predictably

gtk/main.c

@@ -216,7 +216,12 @@ reset(GtkIMContext *ctx)
 static void
 focusout(GtkIMContext *ctx)
 {
-	sendreset((Im*)ctx);
+	Im *im;
+
+	im = (Im*)ctx;
+	sendreset(im);
+	/* Closing the context connection releases engine ownership. */
+	srvclose(im);
 }
 
 static void