ansi-test: reference new git repository
The ANSI test suite is now available at the new canonical git repository located at <git+https://gitlab.common-lisp.net/ansi-test/ansi-test.git>. Depluralized directory at which the ABCL ASDF defintitions look for the tests from "ansi-tests" to "ansi-test" in accordance with the new URI. Remove way-obsolete pre-ASDF2 compatibility check.
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