cosmetics: be more consistent in copyright notices in tests

cosmetics: be more consistent in copyright notices in tests

* tests/cond39.test: Update the heading copyright notice, to be
consistent with the formulation used in the other files.
* tests/cond40.test: Likewise.
* tests/cond41.test: Likewise.
* tests/cond42.test: Likewise.
* tests/cond43.test: Likewise.
* tests/conflnk4.test: Likewise.
* tests/extra8.test: Likewise.
* tests/extra9.test: Likewise.
* tests/suffix13.test: Likewise.
* tests/vala.test: Likewise.
* tests/vala1.test: Likewise.
* tests/vala2.test: Likewise.
* tests/vala3.test: Likewise.
* tests/vala4.test: Likewise.
* tests/vala5.test: Likewise.
* lib/Automake/tests/Condition.pl: Likewise.
* lib/Automake/tests/Condition-t.pl: Likewise.
* lib/Automake/tests/DisjConditions.pl: Likewise.
* lib/Automake/tests/DisjConditions-t.pl: Likewise.
* lib/Automake/tests/Version.pl: Likewise.
* lib/Automake/tests/Wrap.pl: Likewise.
* lib/Automake/tests/Cond2.pl: Add copyright notice.
* lib/Automake/tests/Cond3.pl: Likewise.
* lib/Automake/tests/DisjCon2.pl: Likewise.
* lib/Automake/tests/DisjCon3.pl: Likewise.
* lib/Automake/tests/Version2.pl: Likewise.
* lib/Automake/tests/Version3.pl: Likewise.