idna system test failing on centos[67] (v9_11)

Job #459966 failed for 614bc25b:

I:idna:Checking invalid input U-label (41)
I:idna:Checking invalid input U-label: +noidnin +noidnout (42)
I:idna:Checking invalid input U-label: +noidnin +idnout (43)
I:idna:Checking invalid input U-label: +idnin   +noidnout (44)
I:idna:failed: dig command unexpectedly succeeded
I:idna:Checking invalid input U-label: +idnin   +idnout (45)

idn_locale_to_ace is not failing on invalid input.

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; <<>> DiG 9.11.13 <<>> -i -p 8700 @10.53.0.1 +idnin +noidnout 🧦.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 18972
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 0290622b9447012620106a855ded889488bee751228b272a (good)
;; QUESTION SECTION:
;xn--wv9h.com.                  IN      A

;; AUTHORITY SECTION:
.                       300     IN      SOA     gson.nominum.com. a.root.servers.nil. 2000042100 600 600 1200 600

;; Query time: 0 msec
;; SERVER: 10.53.0.1#8700(10.53.0.1)
;; WHEN: Sun Dec 08 23:34:44 UTC 2019
;; MSG SIZE  rcvd: 135

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/builds/isc-projects/bind9/bin/dig/.libs/lt-dig: 'xn--wv9h.com.' is not a legal IDNA2008 name (string contains a disallowed character), use +noidnout
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