Fix minor timezone memory leak

* src/editfns.c (wall_clock_tz): Remove; unused.
1 job for master in 2 minutes and 32 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #16456937
test

00:02:32

 
Name Stage Failure
failed
test Test There is an unknown failure, please try again
E: Failed to fetch http://deb.debian.org/debian/pool/main/m/manpages/manpages-dev_4.10-2_all.deb  503  Service Temporarily Unavailable [IP: 52.85.90.97 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/r/rename/rename_0.20-4_all.deb 503 Service Temporarily Unavailable [IP: 52.85.90.97 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/s/shared-mime-info/shared-mime-info_1.8-1_amd64.deb 503 Service Temporarily Unavailable [IP: 52.85.90.97 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/x/xdg-user-dirs/xdg-user-dirs_0.15-2+b1_amd64.deb 503 Service Temporarily Unavailable [IP: 52.85.90.97 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/x/xml-core/xml-core_0.17_all.deb 503 Service Temporarily Unavailable [IP: 52.85.90.97 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/g/gnupg2/gnupg-l10n_2.1.18-8_all.deb 503 Service Temporarily Unavailable [IP: 52.85.90.97 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/libt/libtasn1-6/libtasn1-doc_4.10-1_all.deb 503 Service Temporarily Unavailable [IP: 52.85.90.97 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
ERROR: Job failed: exit code 1