That's OpenWrt 14.07. It's pretty old, nevertheless I'd like to keep it updated with security fixes and maybe new features, but I have no idea how to update it. The repository isn't updated in 5 years except for build fixes.
rtl8198c has never been supported by OpenWrt and given the typical system specifications (2/8 or maybe 2/16) it's never going to be supported either. Check "lexra" as search term for further background information.