COMP: fix install process on windows

CMakeLists.txt

@@ -20,5 +20,7 @@ endif()
 
 # Execute and Copy during installation
 install(DIRECTORY python_src DESTINATION  ${CMAKE_INSTALL_PREFIX})
+if(UNIX)
 install(CODE "execute_process(COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/scripts/generate_diapOTBEnv.sh ${CMAKE_INSTALL_PREFIX})")
 install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/scripts/diapOTBEnv.sh PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ DESTINATION ${CMAKE_INSTALL_PREFIX})
+endif()