xorg-server: add a post-install message mentioning required user groups.

srcpkgs/xorg-server/INSTALL

@@ -0,0 +1,17 @@
+case "$ACTION" in
+post)
+	cat <<_EOF
+=======================================================================
+
+${PKGNAME}-${VERSION} 1.16 now requires your user to be a member of
+the *input* and *video* groups to be able to run X without root
+permissions. Make sure to add your user to these groups:
+
+    # sudo usermod -a -G input,video <user>
+
+and the re-login to make it effective.
+
+=======================================================================
+_EOF
+	;;
+esac

srcpkgs/xorg-server/template

@@ -1,7 +1,7 @@
 # Template build file for 'xorg-server'.
 pkgname=xorg-server
 version=1.16.0
-revision=3
+revision=4
 build_style=gnu-configure
 configure_args="--enable-ipv6 --enable-xcsecurity --enable-record
  --enable-xnest --enable-xephyr --enable-composite --enable-xvfb