CMake: Do not look for fctix on Apple

CMakeLists.txt

@@ -74,12 +74,15 @@ if (UNIX)
     find_package(SelfDbg)
     find_package(Ucontext)
     find_package(BFD)
+endif (UNIX)
+
+if(UNIX AND NOT APPLE)
     find_package(Fcitx)
     if (Fcitx_FOUND)
         find_package(DBus1)
         find_package(X11)
     endif(Fcitx_FOUND)
-endif (UNIX)
+endif()
 
 if (MINGW)
     find_package(Demangle)