[Cocos2dx Bug] [win32] Function CCFileUtils::fullPathFromRelativeFile forget consider the path separated by '\'

[Cocos2dx 2.2.4]

[win32平台Bug]

const char* CCFileUtils::fullPathFromRelativeFile(const char *pszFilename, const char *pszRelativeFile)

方法中，没有考虑windows下的 path separated is '\'

源码：

const char* CCFileUtils::fullPathFromRelativeFile(const char *pszFilename, const char *pszRelativeFile)
{
    std::string relativeFile = pszRelativeFile;
    CCString *pRet = CCString::create("");
    pRet->m_sString = relativeFile.substr(0, relativeFile.rfind('/') + 1);
    pRet->m_sString += getNewFilename(pszFilename);
    return pRet->getCString();
}

修改为：

const char* CCFileUtils::fullPathFromRelativeFile(const char *pszFilename, const char *pszRelativeFile)
{
    std::string relativeFile = pszRelativeFile;
    CCString *pRet = CCString::create("");
#if CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
    pRet->m_sString = relativeFile.substr(0, relativeFile.rfind('\') + 1);
#else
    pRet->m_sString = relativeFile.substr(0, relativeFile.rfind('/') + 1);
#endif
    pRet->m_sString += getNewFilename(pszFilename);
    return pRet->getCString();
}