Linking without qxmpp fails for branch features/chat

[Kornel Benko]

...
/usr/src/lyx/lyx/src/frontends/qt4/GuiView.cpp:4177: undefined reference to 
`lyx::frontend::createGuiBuddies(lyx::frontend::GuiView&)'
/usr/src/lyx/lyx/src/frontends/qt4/GuiView.cpp:4183: undefined reference to 
`lyx::frontend::createGuiChat(lyx::frontend::GuiView&)'
...

        Kornel

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