ntdll: Don't Use wine_sigaction on systems without SYS_sigaction

[Robert Shearman]

ChangeLog:
Some systems don't define SYS_sigaction as they use realtime signals. On 
these systems wine_sigaction shouldn't be needed as it is there to work 
around bugs with missing sigaltstack support in glibc, so make the usage 
of wine_sigaction depend on SYS_sigaction being defined.

  dlls/ntdll/signal_i386.c |    6 ++++--
  1 files changed, 4 insertions(+), 2 deletions(-)

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