Remove dead CMake code

CMakeLists.txt

@@ -124,12 +124,6 @@ include_directories ("${CMAKE_CURRENT_BINARY_DIR}/krfb"
                      "${CMAKE_CURRENT_SOURCE_DIR}/krfb/ui"
 )
 
-if(Q_WS_X11)
-  if(NOT X11_XTest_FOUND)
-    message(FATAL_ERROR "krfb requires the libXtst (https://xorg.freedesktop.org) to be built")
-  endif(NOT X11_XTest_FOUND)
-endif(Q_WS_X11)
-
 add_subdirectory(events)
 add_subdirectory(krfb)
 add_subdirectory(framebuffers)