整理SimpleAudioEngine修改记录(IOS端)

Cocos2dx引擎版本：3.17.2

路径：SimpleAudioEngin.mm

static void static_setBackgroundMusicCurrentTime(float currentTime)
{
    [[SimpleAudioEngine sharedEngine] setBackgroundMusicCurrentTime:currentTime];
}  

static float static_getBackgroundMusicCurrentTime()
{
    return [[SimpleAudioEngine sharedEngine] getBackgroundMusicCurrentTime];
}  

float SimpleAudioEngine::getBackgroundMusicCurrentTime() 
{
    return static_getBackgroundMusicCurrentTime();
}

void SimpleAudioEngine::setBackgroundMusicCurrentTime(float currentTime) 
{
    static_setBackgroundMusicCurrentTime(currentTime);
}

路径：SimpleAudioEngine_objc.m

-(void) setBackgroundMusicCurrentTime:(float) currentTime 
{
    [am setBackgroundMusicCurrentTime:currentTime]
}

-(float) getBackgroundMusicCurrentTime
{
    return [am getBackgroundMusicCurrentTime];
}

路径：CDAudioManager.m

-(void) setBackgroundMusicCurrentTime:(float) currentTime 
{
    [self.backgroundMusic.audioSourcePlayer setCurrentTime:currentTime];
}

-(float) getBackgroundMusicCurrentTime
{
    return self.backgroundMusic.audioSourcePlayer.currentTime;
}