Problems with "--without-lobby"

[fabio]

Building with "--without-lobby" is broken, it still requires gloox:

In file included from ../../../source/lobby/glooxwrapper/glooxwrapper.cpp:20:0:
../../../source/lobby/glooxwrapper/glooxwrapper.h:71:26: fatal error: gloox/client.h: File o directory non esistente
 #include <gloox/client.h>
                          ^

After installing gloox, it builds/tests fine, however it doesn't run properly:

ERROR: GUI page 'page_gamesetup_mp.xml': Failed to call init() function
ERROR: JavaScript error: gui/gamesetup/gamesetup_mp.js line 14
TypeError: Engine.HasXmppClient is not a function
  init([object Object],(void 0))@gui/gamesetup/gamesetup_mp.js:14
  __eventhandler9 (press)([object Object])@subMenuMultiplayerJoinButton press:2
ERROR: JavaScript error: gui/gamesetup/gamesetup_mp.js line 48
TypeError: Engine.LobbySetPlayerPresence is not a function
  cancelSetup()@gui/gamesetup/gamesetup_mp.js:48
...

[leper]

In 14113:

Fix building with --without-lobby. Fixes #2249.

[ben]

In 14117:

Fixes --without-lobby for MSVC and clang, refs #2249.
Cleans up some whitespace.
Removes obsolete PCH files.