qtile: rework package

* Use absolute paths to load gobject, pango and cairo.
* Add xcb-cursor support (also with absolute path)
* Avoid tainting child processes environment:
  Save PATH and PYTHONPATH in wrapper, and restore them in python code.
* Alter restart process, using $0 saved in wrapper, which allow user
  to restart qtile after system rebuild to upgrade it.

pkgs/applications/window-managers/qtile/0003-Restart-executable.patch

@@ -0,0 +1,25 @@
+From b560c11078fecc35df2c62f34beda06c4e80a10d Mon Sep 17 00:00:00 2001
+From: "Alexander V. Nikolaev" <avn@avnik.info>
+Date: Fri, 27 Nov 2015 10:54:35 +0200
+Subject: [PATCH 3/3] Restart executable
+
+---
+ libqtile/manager.py | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libqtile/manager.py b/libqtile/manager.py
+index b1a38e2..110f7d8 100644
+--- a/libqtile/manager.py
++++ b/libqtile/manager.py
+@@ -1339,7 +1339,7 @@ class Qtile(command.CommandObject):
+         argv = [s for s in argv if not s.startswith('--with-state')]
+         argv.append('--with-state=' + buf.getvalue().decode())
+ 
+-        self.cmd_execute(sys.executable, argv)
++        self.cmd_execute(os.environ.get("QTILE_WRAPPER", "@out@/bin/qtile"), argv[1:])
+ 
+     def cmd_spawn(self, cmd):
+         """
+-- 
+2.6.3
+