[Tests] changes because an ML module cannot be shared by several test files

tests/misc/global_decl_loc.i

 /* run.config
- COMMENT: the script "global_decl_loc.ml" is also used by the test "global_decl_loc2.i"
- SCRIPT: global_decl_loc
+ COMMENT: the script "global_decl_loc.ml" is also copied by the test "global_decl_loc2.i"
+ MODULE: global_decl_loc
    OPT: @PTEST_DIR@/global_decl_loc2.i
  */
 

tests/misc/global_decl_loc2.i

 /* run.config*
+ COMMENT: todo in the future: removes the EXECNOW command and modifies the MODULE directive in order to reuse "global_decl_loc"
  COMMENT: the script "global_decl_loc.ml" is also used by the test "global_decl_loc.i"
- SCRIPT: global_decl_loc
+ EXECNOW: BIN global_decl_loc2.ml cp @PTEST_DIR@/global_decl_loc.ml @PTEST_RESULT@/global_decl_loc2.ml > @DEV_NULL@ 2> @DEV_NULL@
+ MODULE: result/global_decl_loc2
    OPT: @PTEST_DIR@/global_decl_loc.i
 */
-
 extern int g;
 
 int main(void) {