Re-instate vale-install Makefile target

What does this Merge Request do?

Reverts !1517 (merged) as another fix was put in place !1518 (merged).

Closes #1057 (closed)

Merge Request checklist

• Tests added for new functionality. If not, please raise Issue to follow-up.
• This change is backward compatible. If not, please include steps to communicate to our users.
• Documentation added/updated, if needed.
• gdk doctor test added, if needed.