[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(, relativeFile.rfind('/') + );
     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(, relativeFile.rfind('\\') + );
 #else
     pRet->m_sString = relativeFile.substr(, relativeFile.rfind('/') + );
 #endif
     pRet->m_sString += getNewFilename(pszFilename);
     return pRet->getCString();
 }