pins-ext is also apparently broken on C3.
pins-loop however gives concerning output:
```
➜  workspace glasgow run selftest pins-loop
I: g.device.hardware: device already has bitstream ID 5a6b070adeb0a5801b2d489d2af4cc62
I: g.cli: running handler for applet 'selftest'
I: g.applet.internal.selftest: running self-test mode pins-loop
E: g.applet.internal.selftest: pins-loop: fault: A2 B2 B7
E: g.applet.internal.selftest: self-test: FAIL
➜  workspace glasgow run selftest pins-loop
I: g.device.hardware: device already has bitstream ID 5a6b070adeb0a5801b2d489d2af4cc62
I: g.cli: running handler for applet 'selftest'
I: g.applet.internal.selftest: running self-test mode pins-loop
E: g.applet.internal.selftest: pins-loop: fault: B7 A1 A0 B1 B0
E: g.applet.internal.selftest: pins-loop: fault: B7 A1 A0 A7 B1 B0
E: g.applet.internal.selftest: self-test: FAIL
➜  workspace glasgow run selftest pins-loop
I: g.device.hardware: device already has bitstream ID 5a6b070adeb0a5801b2d489d2af4cc62
I: g.cli: running handler for applet 'selftest'
I: g.applet.internal.selftest: running self-test mode pins-loop
E: g.applet.internal.selftest: pins-loop: fault: B0 B7 A1 B1
E: g.applet.internal.selftest: pins-loop: fault: B0 B7 A1 B1
E: g.applet.internal.selftest: self-test: FAIL
```