disable libudev detection

Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -139,11 +139,6 @@ elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux" OR
     set(USE_DBUS_DEFAULT 1)
     set(ENABLE_VR_DEFAULT 1)
 
-    find_package(UDev QUIET)
-    if(UDEV_FOUND)
-        set(EVENT_INPUT_DEFAULT 1)
-    endif(UDEV_FOUND)
-
     find_package(Speex)
     find_package(Speexdsp)
     if(SPEEX_FOUND AND SPEEXDSP_FOUND)
