downspeed and upspeed don't work

[npyl]

downspeed and upspeed seem not to be working.
The problem is, that when used without arguments (conky -t '$downspeed'), conky shows down/up speed for the default-net-device which is configured by default to eth0 for all Operating Systems in ConkyBuildOptions.cmake. Though, on macOS the default device is en0.

This problem can be easily amended by adding specific code for macOS or by always compiling conky with correct DEFAULTNETDEV.

[npyl]

Going with the

adding specific code for macOS or by always compiling conky with correct DEFAULTNETDEV

way. Also, must update wiki so that we never accidentally forget this.

[npyl]

Wiki updated: complete guide for compiling