Revert "xfce4-session: update to 4.12.1."

This reverts commit 020b1e8199.

Needs libxfce4ui>=4.12.1 that has not been yet released.

srcpkgs/xfce4-session/template

@@ -1,6 +1,6 @@
 # Template file for 'xfce4-session'
 pkgname=xfce4-session
-version=4.12.1
+version=4.12.0
 revision=1
 build_style=gnu-configure
 configure_args="--disable-static --enable-upower --enable-polkit"
@@ -14,7 +14,7 @@ maintainer="Juan RP <xtraeme@gmail.com>"
 license="GPL-2"
 homepage="http://xfce.org"
 distfiles="http://archive.xfce.org/src/xfce/$pkgname/${version%.*}/$pkgname-$version.tar.bz2"
-checksum=97d7f2a2d0af7f3623b68d1f04091e02913b28f9555dab8b0d26c8a1299d08fd
+checksum=68c85453b097d3ada573dcb7e72acd06e0fc34531996122c10d20096405b7b06
 
 pre_configure() {
 	mkdir m4