[ptests] more use of the MODULE directive

tests/misc/global_decl_loc.i

tests/misc/global_decl_loc2.i

tests/misc/oracle/global_decl_loc.res.oracle

tests/misc/oracle/global_decl_loc2.res.oracle

tests/misc/test_config

tests/pdg/dyn_dpds.c

tests/saveload/deps.i

tests/saveload/oracle/deps_sav.res

tests/saveload/serialized_queue.i

tests/slicing/adpcm.c

tests/slicing/combine.i

tests/slicing/ex_spec_interproc.i

tests/slicing/mark_all_slices.i

tests/slicing/merge.i

tests/slicing/min_call.c

tests/slicing/select_by_annot.i

tests/slicing/select_simple.c

tests/slicing/simple_intra_slice.i

tests/slicing/slice_no_body.i

tests/slicing/switch.i