MSVC compiler support [patch 28]: setvbuf crash

[Michael Goffioul]

setvbuf leads to a crash when called on a pipe (don't know why).

Index: src/oct-procbuf.cc
===================================================================
RCS file: /cvs/octave/src/oct-procbuf.cc,v
retrieving revision 1.30
diff -p -c -r1.30 oct-procbuf.cc
*** src/oct-procbuf.cc  8 May 2006 20:23:05 -0000       1.30
--- src/oct-procbuf.cc  17 Oct 2006 11:07:42 -0000
*************** octave_procbuf::open (const char *comman
*** 78,85 ****
--- 78,87 ----
  
    open_p = true;
  
+ #ifndef _MSC_VER
    if (mode & std::ios::out)
      ::setvbuf (f, 0, _IOLBF, 0);
+ #endif
  
    return this;