Fix a transliteration with a patch from Mike Fabian.
It has been approved by upstream, but a chunk is missing.

See https://lists.nongnu.org/archive/html/m17n-list/2015-08/msg00001.html
and https://bugzilla.redhat.com/show_bug.cgi?id=1256244

PR: 214968
Approved by: maintainer
Obtained from: Mike Fabian