[MacPorts] #45318: zsh: add texi2html build dependency

[MacPorts]

#45318: zsh: add texi2html build dependency
---------------------------------+--------------------------------
 Reporter:  ionic@…              |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.1
 Keywords:  haspatch maintainer  |       Port:  zsh
---------------------------------+--------------------------------
 `zsh` doesn't build without `texi2html` in `trace mode`. Add it.

-- 
Ticket URL: <https://trac.macports.org/ticket/45318>
MacPorts <http://www.macports.org/>
Ports system for OS X