tests: ecore: try to keep constness for Efl_Version

It returns as const so better try to keep this be having the avriable const as
well.

src/tests/ecore/ecore_test_ecore.c

@@ -850,7 +850,7 @@ END_TEST
 
 START_TEST(ecore_test_efl_app_version)
 {
-   Efl_Version *ver;
+   const Efl_Version *ver;
    Eo *loop;
 
    ecore_init();