gdm: Rebuild 3.4.1 for correct X server path

Currently `/usr/X11R6` points to `/usr`.

```
> ls -l /usr/X11R6
lrwxrwxrwx 1 root system 4 Jun 15 04:36 /usr/X11R6 -> /usr
```

The GDM configure script, goes through all these paths, to determine the
path for the X server binary.

Therefore, remove the symbolic link, already done by removing
XScreenSaver 5.11 with `sudo bee update xscreensaver`, and rebuild GDM,
so that it picks up the binaries under `/usr/bin`.

Another option would be, to hardcode the know paths as done in
OpenEmbedded [1].

[1] https://github.com/openembedded/meta-openembedded/blob/master/meta-gnome/recipes-gnome/gdm/gdm/cross-xdetection.diff

gdm-3.4.1-13.bee

@@ -0,0 +1,38 @@
+#!/bin/env beesh
+
+SRCURL[0]="http://ftp.gnome.org/pub/gnome/sources/gdm/${PKGVERSION[2]}/gdm-${PKGVERSION}.tar.xz"
+
+PATCHURL[0]="/src/mariux/download/gdm-3.4.1-0001-greeter-always-enable-debugging.patch"
+PATCHURL[1]="/src/mariux/download/gdm-3.4.1-0002-greeter-disable-handling-of-ESC-in-login-window.patch"
+PATCHURL[2]="/src/mariux/download/gdm-3.4.1-0003-greeter-never-show-cancel-button-in-login-window.patch"
+
+LIBEXECDIR=/usr/lib/gdm
+LOCALSTATEDIR=/var
+
+EXCLUDE[0]="^/var/run ^/var/cache ^/etc/tmpfiles.d$"
+
+mee_configure() {
+    bee_configure \
+        --with-pam-prefix=/etc
+}
+
+mee_install_post() {
+
+    mv ${D}/etc/pam.d{,.sample}
+
+    mkdir -pv ${D}/etc/tmpfiles.d
+
+    cat >${D}/etc/tmpfiles.d/gdm.conf <<-"EOF"
+	d /run/gdm         0711 root gdm -
+	d /run/gdm/greeter 0755 gdm  gdm -
+	d /var/cache/gdm   1755 root gdm -
+	EOF
+
+    cat >${D}/etc/dconf/db/gdm.d/99-disable-user-list <<-"EOF"
+	[org/gnome/login-screen]
+	disable-user-list=true
+
+	[org/gnome/desktop/session]
+	session-name='gdm-fallback'
+	EOF
+}