calibre: 2.64.0 -> 2.66.0 (#18311)

A few additional changes:

1. We load patches from debian for improving privacy and security
2. Now with QT 5.6 instead of 5.5
3. We strip bundled python code and use proper upstream instead

pkgs/applications/misc/calibre/no_updates_dialog.patch

@@ -1,16 +0,0 @@
-# Description: Disable update check by default.
-Index: calibre/src/calibre/gui2/main.py
-===================================================================
---- calibre.orig/src/calibre/gui2/main.py	2014-02-02 10:41:28.470954623 +0100
-+++ calibre/src/calibre/gui2/main.py	2014-02-02 10:41:56.546954247 +0100
-@@ -37,8 +37,8 @@
-                       help=_('Start minimized to system tray.'))
-     parser.add_option('-v', '--verbose', default=0, action='count',
-                       help=_('Ignored, do not use. Present only for legacy reasons'))
--    parser.add_option('--no-update-check', default=False, action='store_true',
--            help=_('Do not check for updates'))
-+    parser.add_option('--update-check', dest='no_update_check', default=True, action='store_false',
-+            help=_('Check for updates'))
-     parser.add_option('--ignore-plugins', default=False, action='store_true',
-             help=_('Ignore custom plugins, useful if you installed a plugin'
-                 ' that is preventing calibre from starting'))