Jason Smith 45731bd022
Fix at90usb1286 build (#19687)
* Skip check for USBCON during dependency detection
* Ignore incompatible Teensy_ADC library, which requires Teensy >= 3
* Add IS_AT90USB

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>
2020-10-11 18:13:01 -05:00
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