ntdll: exception.c: pretend signal handler parameters have no holes

[Dan Kegel]

The operating system invokes signal handlers with
pointers to two structs (siginfo_t and ucontext_t).
For some reason (perhaps because these structs
are very fluffy, and have large holes in them),
valgrind objects when we send these structs to wineserver.
So mark those structs fully defined to make Valgrind happy.
(I should ask John Reiser to review this...)

Fixes warnings like
 Syscall param writev(vector[...]) points to uninitialised byte(s)
    at  (within /lib/ld-2.7.so)
    by  send_request (server.c:246)
    by  wine_server_call (server.c:327)
    by  send_debug_event (exception.c:200)
    by  raise_exception (exception.c:357)
    by  __regs_RtlRaiseException (exception.c:388)
    by  raise_segv_exception (signal_i386.c:1190)
    by  ???
    by  func_image (image.c:472)
    by  run_test (test.h:421)
    by  main (test.h:470)
  Address 0x7f21fd34 is on thread 1's stack
  Uninitialised value was created by a client request
    at  setup_exception_record (signal_i386.c:1081)
    by  segv_handler (signal_i386.c:1312)
    by  (within /lib/tls/i686/cmov/libpthread-2.7.so)
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