vchoi_fork

[svn-r2750] 
Purpose:
    Port to Windows.
Description:
    The stream_test program now also compiles and can be run under Windows.
Solution:
    The problem was that fork(2) and waitpid(2) aren't available
    under Windows when using the MS compilers.
    So I test for both H5_HAVE_FORK and H5_HAVE_WAITPID.
    These are already checked fortunately during configuration.

    If they are not there the code just says
      printf ("Test skipped because this architecture doesn't provide "
              "fork(2) and waitpid(2)\n");

Platforms tested:
    Windows NT, both with MS Visual C++ and GNU cc
    Now you can build and run the Stream VFD testsuite under Windows
    when using GNU cc !!