Add missing file.
Merge topic 'fix-transitive-target-names' into next

a85ddd7 Add missing file.
Extend the range of valid target names with the + sign.

As noted in #13986, this character can commonly be used for target
names, such as those containing 'c++'.

Suggested-By: Benjamin Kloster
Merge topic 'fix-transitive-target-names' into next

625bb62 Extend the range of valid target names with the + sign.