print only the name to the env XML file (instead of full path)

cmake/GaudiProjectConfig.cmake

@@ -1395,7 +1395,8 @@ function(gaudi_generate_env_conf filename)
     set(data "${data}  ${ln}\n")
   endwhile()
   set(data "${data}</env:config>\n")
-  message(STATUS "Generating ${filename}")
+  get_filename_component(fn ${filename} NAME)
+  message(STATUS "Generating ${fn}")
   file(WRITE ${filename} "${data}")
 endfunction()