Derive `Debug` and eq. comparison traits for `InvalidRustTarget` enum #2706

Job	Run time
quickchecking	13s
minimal	10s
msrv	49s
docs	17s
rustfmt-clippy	27s
check-cfg	20s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 44s
test-book	8s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 35s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 38s
test-expectations (ubuntu-latest)	38s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 35s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	2m 10s
test-expectations (macos-latest)	41s
test-no-headers	24s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	2m 16s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	2m 8s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	2m 5s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	7m 4s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	11m 6s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	5m 25s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	6m 14s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	8m 21s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	7m 37s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	7m 43s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	7m 16s
test (ubuntu-latest, 16.0, 0, 0, 1)	2m 30s
test (macos-latest, 16.0, 0, 0, 0)	1m 51s
success	1s
	1h 24m 26s

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