The package built with poudriere is not affected, it links against the ncuses in base.
When devel/ncurses is installed in the system, the Zsh configure script detects and uses
${LOCALBASE}/include/ncurses/ncurses.h instead.
The patch is obtained from this commit:
https://sourceforge.net/p/zsh/code/ci/c6a85163619ed1cee89ab047a0d98108ed46828d/
Proposed commit log message:
```
shells/zsh: Fix build with devel/ncurses 6.2
cc -c -I. -I../../Src -I../../Src -I../../Src/Zle -I. -I/usr/local/include -DBOOL_DEFINED -DLIBICONV_PLUG -DHAVE_CONFIG_H -DMODULE -O2 -pipe -DLIBICONV_PLUG -fstack-protector-strong -fno-strict-aliasing -fPIC -o curses..o curses.c
In file included from curses.c:210:
./curses_keys.h:93:15: error: use of undeclared identifier 'KEY_EVENT'
{"EVENT", KEY_EVENT},
^
1 error generated.
*** Error code 1
Reviewed_by: bapt, koobs
Approved by: bapt (maintainer), koobs (ports, mentor),
Differential_Revision: D26355
MFH: 2020Q3
```