Deparse implicit with ‘use feature’

Deparse implicit with ‘use feature’

When a version declaration has been seen, it’s not possible to deparse
the code perfectly correctly, but using ‘no feature; use feature
"5.14"’ is a reasonable tradeoff.  See also commit 1c74777c25.

This necessitated sorting %^H keys that are output to keep tests pass-
ing.  Previously they were relying on phases of the moon.