oleaut32: tests/usrmarshal.c: initialize reserved fields to unique values

[Dan Kegel]

This strengthens the marshaling test a tad.
Tested on XP and Wine.
Fixes numerous valgrind warnings like

 Conditional jump or move depends on uninitialised value(s)
    at  winetest_ok (test.h:269)
    by  check_variant_header (usrmarshal.c:487)
    by  test_marshal_VARIANT (usrmarshal.c:544)
    by  func_usrmarshal (usrmarshal.c:1282)
    by  run_test (test.h:421)
    by  main (test.h:470)
  Uninitialised value was created by a stack allocation
    at  test_marshal_VARIANT (usrmarshal.c:501)

and

 Conditional jump or move depends on uninitialised value(s)
    at  bcmp (mc_replace_strmem.c:442)
    by  test_marshal_VARIANT (usrmarshal.c:905)
    by  func_usrmarshal (usrmarshal.c:1282)
    by  run_test (test.h:421)
    by  main (test.h:470)
  Uninitialised value was created by a stack allocation
    at  test_marshal_VARIANT (usrmarshal.c:501)
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