Ethernet.setRetransmissionTimeout, Ethernet.setRetransmissionCount

Both of these functions are defined in the Ethernet.h header, but the actual code is nowhere to be found, and I get a linker error

`
Ethernet.setRetransmissionTimeout(150);

Ethernet.setRetransmissionCount(1);
`

`
Z:\User\RS\EnviroWatch/EthernetInterface.ino:126: undefined reference to arduino::EthernetClass::setRetransmissionTimeout(unsigned short)
Z:\User\RS\EnviroWatch/EthernetInterface.ino:127: undefined reference to arduino::EthernetClass::setRetransmissionCount(unsigned char)
`

Is this an oversight or by design?

Start with the declarations in Ethernet.h and trace the EthernetClass implementation for setRetransmissionTimeout and setRetransmissionCount. Use the calls at lines 126-127 of EthernetInterface.ino to reproduce the linker error; done means both calls link successfully with the expected Ethernet behavior.

Written by the indexing model from the issue text.