Changed the ordering of the build include directory and the source include directory to avoid build issues on systems where a different version of the OSG has been built in-source then another built out-of-source resulting in conflicts

CMakeLists.txt

@@ -330,13 +330,14 @@ IF(UNIX AND NOT ANDROID)
 
 ENDIF()
 
-INCLUDE_DIRECTORIES(${OpenSceneGraph_SOURCE_DIR}/include/)
 
 # Make the headers visible to everything
 IF(NOT ${PROJECT_BINARY_DIR} EQUAL ${PROJECT_SOURCE_DIR})
    INCLUDE_DIRECTORIES(${PROJECT_BINARY_DIR}/include)
 ENDIF()
 
+INCLUDE_DIRECTORIES(${OpenSceneGraph_SOURCE_DIR}/include/)
+
 INCLUDE_DIRECTORIES(SYSTEM ${OPENGL_INCLUDE_DIR})
 
 # Common global definitions