[macosx] right JNFCall* method should be used in JDK-8008728 fix

src/macosx/native/sun/awt/AWTWindow.m
 377 "checkBlockingAndOrder", "()Z");
 378 JNFCallVoidMethod(env, platformWindow, jm_checkBlockingAndOrder);

JNFCallVoidMethod should be changed to Boolean one.