upgpkg: 6.4-2

Fix CVE-2023-29491 by configuring with `--disable-setuid-environ`:
https://bugs.archlinux.org/task/78578

PKGBUILD

@@ -5,7 +5,7 @@
 
 pkgname=ncurses
 pkgver=6.4
-pkgrel=1
+pkgrel=2
 pkgdesc='System V Release 4.0 curses emulation library'
 arch=(x86_64)
 url='https://invisible-island.net/ncurses/ncurses.html'
@@ -42,6 +42,7 @@ prepare() {
 build() {
   local configure_options=(
     --prefix=/usr
+    --disable-setuid-environ
     --enable-widec
     --enable-pc-files
     --mandir=/usr/share/man