fix build for independent build dir

tools/assimp_cmd/CMakeLists.txt

@@ -42,6 +42,7 @@ cmake_minimum_required( VERSION 2.6 )
 INCLUDE_DIRECTORIES(
   ${Assimp_SOURCE_DIR}/include
   ${Assimp_SOURCE_DIR}/code
+  ${Assimp_BINARY_DIR}/tools/assimp_cmd
 )
 
 LINK_DIRECTORIES( ${Assimp_BINARY_DIR} ${Assimp_BINARY_DIR}/lib )