cmake: Create kbackgammon/engines/dummy.cpp outside source tree

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

kbackgammon/engines/CMakeLists.txt

@@ -28,12 +28,12 @@ link_directories(
 )
 
 
-file( WRITE dummy.cpp "" )
+file( WRITE ${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp "" )
 
 ##### kbgengines (static) #######################
 
 tde_add_library( kbgengines STATIC_PIC AUTOMOC
-  SOURCES dummy.cpp
+  SOURCES ${CMAKE_CURRENT_BINARY_DIR}/dummy.cpp
   LINK kbgoffline-static kbggnubg-static kbggeneric-static kbgfibs-static
     kbgnextgen-static
 )