fix undefined virtual methods #296
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without these definitions I'd got the error, when I tried to use templates in my project:
.pioenvs\d1_mini\lib9ab\libWebSockets_ID549.a(WebSocketsServer.cpp.o):(.rodata._ZTI16WebSocketsServer[_ZTI16WebSocketsServer]+0x10): undefined reference totypeinfo for WebSockets'collect2.exe: error: ld returned 1 exit status`