xfce4-session: fix issue that prevents `startxfce4` from starting

This commit should fix issue when startxfce4 doesn't detect a DISPLAY
variable and exits non-zero code, fixes #734

x11-packages/xfce4-session/build.sh

@@ -3,7 +3,7 @@ TERMUX_PKG_DESCRIPTION="A session manager for XFCE environment"
 TERMUX_PKG_LICENSE="GPL-2.0"
 TERMUX_PKG_MAINTAINER="@termux"
 TERMUX_PKG_VERSION=4.16.0
-TERMUX_PKG_REVISION=6
+TERMUX_PKG_REVISION=7
 TERMUX_PKG_SRCURL=http://archive.xfce.org/src/xfce/xfce4-session/${TERMUX_PKG_VERSION:0:4}/xfce4-session-${TERMUX_PKG_VERSION}.tar.bz2
 TERMUX_PKG_SHA256=22f273f212481d71e0b5618c62710cd85f69aea74f5ea5c0093f7918b07d17b7
 TERMUX_PKG_DEPENDS="gnupg, hicolor-icon-theme, libsm, libwnck, libxfce4ui, xfce4-settings, xfdesktop, pango, xfwm4, xorg-iceauth, xorg-xrdb"

x11-packages/xfce4-session/disable-xinit-null-display.patch

@@ -1,20 +1,21 @@
-diff -uNr xfce4-session-4.16.0.mod/scripts/startxfce4.in xfce4-session-4.16.0/scripts/startxfce4.in
---- xfce4-session-4.16.0.mod/scripts/startxfce4.in	2016-05-02 21:02:14.000000000 +0000
-+++ xfce4-session-4.16.0/scripts/startxfce4.in	2022-03-22 03:38:13.853954163 +0000
-@@ -89,14 +89,9 @@
+diff -uNr xfce4-session-4.16.0/scripts/startxfce4.in xfce4-session-4.16.0.mod/scripts/startxfce4.in
+--- xfce4-session-4.16.0/scripts/startxfce4.in	2016-05-02 21:02:14.000000000 +0000
++++ xfce4-session-4.16.0.mod/scripts/startxfce4.in	2022-04-12 08:25:51.362449242 +0000
+@@ -88,14 +88,9 @@
+ fi
  export XDG_CONFIG_DIRS
  
- if test "x$DISPLAY" = "x"
-+  echo "$0: Failed to connect to display"
-+  exit 1
- then
+-if test "x$DISPLAY" = "x"
+-then
 -  echo "$0: Starting X server"
 -  prog=xinit
 -
 -  if test ! "x$XDG_VTNR" = "x"; then
 -    SERVERRC="vt$XDG_VTNR $SERVERRC"
 -  fi
--else
++if test "x$DISPLAY" = "x"; then
++  echo "$0: Failed to connect to display"
++  exit 2
+ else
    echo "$0: X server already running on display $DISPLAY"
    prog=/bin/sh
- fi