Made Keyboard.poll behave like win32 version

src/native/linux/org_lwjgl_input_Keyboard.cpp

@@ -194,7 +194,7 @@ int checkKeyEvents(unsigned char *result_buf) {
 JNIEXPORT void JNICALL Java_org_lwjgl_input_Keyboard_nPoll
   (JNIEnv * env, jclass clazz, jint buf)
 {
-	checkKeyEvents(NULL);
+	//checkKeyEvents(NULL);
 	memcpy((unsigned char*)buf, key_buf, KEYBOARD_SIZE*sizeof(unsigned char));
 }