xcompmgr: generate along with xorg stuff

Also a minor update.
/cc maintainer @astsmtl.

pkgs/applications/window-managers/xcompmgr/default.nix

@@ -1,22 +0,0 @@
-{ stdenv, fetchurl, pkgconfig, libXcomposite, libXfixes, libXdamage
-, libXrender, libXext }:
-stdenv.mkDerivation rec {
-  name = "xcompmgr-1.1.6";
-  src = fetchurl {
-    url = "mirror://xorg/individual/app/${name}.tar.bz2";
-    sha256 = "c98949d36793b30ed1ed47495c87a05fa245ac0fc2857d2abc54979124687c02";
-  };
-  buildInputs = [ pkgconfig libXcomposite libXfixes libXdamage libXrender libXext ];
-  meta = {
-    homepage = http://www.x.org/;
-    description = "A sample compositing manager for X servers";
-    longDescription = ''
-      A sample compositing manager for X servers supporting the XFIXES,
-      DAMAGE, RENDER, and COMPOSITE extensions.  It enables basic eye-candy
-      effects.
-    '';
-    license = "bsd";
-    maintainers = with stdenv.lib.maintainers; [ astsmtl ];
-    platforms = with stdenv.lib.platforms; linux;
-  };
-}

pkgs/servers/x11/xorg/default.nix

@@ -1294,6 +1294,16 @@ let
     buildInputs = [pkgconfig libX11 ];
   }) // {inherit libX11 ;};
 
+  xcompmgr = (mkDerivation "xcompmgr" {
+    name = "xcompmgr-1.1.7";
+    builder = ./builder.sh;
+    src = fetchurl {
+      url = mirror://xorg/individual/app/xcompmgr-1.1.7.tar.bz2;
+      sha256 = "14k89mz13jxgp4h2pz0yq0fbkw1lsfcb3acv8vkknc9i4ld9n168";
+    };
+    buildInputs = [pkgconfig libXcomposite libXdamage libXext libXfixes libXrender ];
+  }) // {inherit libXcomposite libXdamage libXext libXfixes libXrender ;};
+
   xcursorgen = (mkDerivation "xcursorgen" {
     name = "xcursorgen-1.0.6";
     builder = ./builder.sh;

pkgs/servers/x11/xorg/tarballs-7.7.list

@@ -108,6 +108,7 @@ mirror://xorg/individual/app/xbacklight-1.2.1.tar.bz2
 mirror://xorg/X11R7.7/src/everything/xbitmaps-1.1.1.tar.bz2
 mirror://xorg/X11R7.7/src/everything/xcmiscproto-1.2.2.tar.bz2
 mirror://xorg/individual/app/xcmsdb-1.0.5.tar.bz2
+mirror://xorg/individual/app/xcompmgr-1.1.7.tar.bz2
 mirror://xorg/individual/app/xcursorgen-1.0.6.tar.bz2
 mirror://xorg/individual/data/xcursor-themes-1.0.4.tar.bz2
 mirror://xorg/individual/app/xdpyinfo-1.3.2.tar.bz2

pkgs/top-level/all-packages.nix

@@ -12807,7 +12807,7 @@ let
 
   xchm = callPackage ../applications/misc/xchm { };
 
-  xcompmgr = callPackage ../applications/window-managers/xcompmgr { };
+  inherit (xorg) xcompmgr;
 
   compton = callPackage ../applications/window-managers/compton { };