test: purge stale disabled tests

Tests in the disabled directory are not used by Makefile nor by the CI.
Other than a single 2015 commit that puts 'use strict' in each test,
many of them haven't been touched in years.

This removes all the disabled tests that have been unmodified since
2011 (with the exception of the 'use strict' modification mentioned
above).

PR-URL: #2045
Reviewed-By: Ben Noordhuis <[email protected]>
Reviewed-By: Evan Lucas <[email protected]>

Author: Trott