CMake: remove dead code.

CMakeLists.txt

@@ -91,7 +91,6 @@ ENDIF(ASSIMP_DOUBLE_PRECISION)
 
 configure_file(
   ${CMAKE_CURRENT_LIST_DIR}/revision.h.in
-#  ${CMAKE_CURRENT_SOURCE_DIR}/revision.h.in
   ${CMAKE_CURRENT_BINARY_DIR}/revision.h
 )