units: Remove Gentoo specific xdm.service

That unity pulls in OpenRC which in turn pulls in most of legacy
system that causes lots of troubles as it is too smart, thus not
recommended.

Moreover, SystemD developers seems to agree that a service file per DM
is the best approach, so having gdm.service, kdm.service, slim.service
is better than a single wrapper for them.

Makefile.am

@@ -334,10 +334,6 @@ dist_systemunit_DATA += \
 	units/fedora/plymouth-halt.service
 endif
 
-if TARGET_GENTOO
-dist_systemunit_DATA += \
-	units/gentoo/xdm.service
-endif
 
 if TARGET_ARCH
 dist_systemunit_DATA += \
@@ -1309,14 +1305,6 @@ if TARGET_FEDORA
 		rm -f display-manager.service && \
 		$(LN_S) $(systemunitdir)/display-manager.service display-manager.service )
 endif
-if TARGET_GENTOO
-	( cd $(DESTDIR)$(systemunitdir) && \
-		rm -f display-manager.service && \
-		$(LN_S) xdm.service display-manager.service )
-	( cd $(DESTDIR)$(systemunitdir)/graphical.target.wants && \
-		rm -f display-manager.service && \
-		$(LN_S) $(systemunitdir)/display-manager.service display-manager.service )
-endif
 if TARGET_DEBIAN_OR_UBUNTU
 	( cd $(DESTDIR)$(systemunitdir) && \
 		rm -f runlevel5.target && \

units/gentoo/Makefile

@@ -1 +0,0 @@
-../../src/Makefile

units/gentoo/xdm.service

@@ -1,17 +0,0 @@
-#  This file is part of systemd.
-#
-#  systemd is free software; you can redistribute it and/or modify it
-#  under the terms of the GNU General Public License as published by
-#  the Free Software Foundation; either version 2 of the License, or
-#  (at your option) any later version.
-
-[Unit]
-Description=Display Manager
-After=syslog.target dbus.target hald.service
-
-[Service]
-ExecStart=/etc/init.d/xdm start
-
-[Install]
-Alias=display-manager.service
-WantedBy=graphical.target