versions: restore original constant

Before:

  f1 = Formula.factory('tree')
  f1.versions
  f2 = Formula.factory('tree')
  f1.class == f2.class # => false

After:

  f1 = Formula.factory('tree')
  f1.versions
  f2 = Formula.factory('tree')
  f1.class == f2.class # => true
discount 2.1.7
fuzzy-find 0.6.0

Closes #25091.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
dart 30798

Closes #25089.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
datomic 0.9.4331

Closes #25082.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
jbossforge 1.4.3.Final

Closes #25088.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
nexus 2.7.0-04

Closes #25094.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
selenium-server-standalone 2.38.0

Closes #25096.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
sbuild 0.7.0

Closes #25075.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
collectd 5.4.0
midnight-commander 4.8.11