Unbound classpath variable: 'wpilib'

Our team runs into this every year, and every year I forget how to fix it:

Unbound classpath variable: 'networktables' in project 'TESTROBOT'. Unbound classpath variable: 'networktables' in project 'TESTROBOT'

I decided that this is the year I'll write it down. (Probably now that I've documented it they'll fix it next year.)

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