boost::filesystem::native() should reject '/' on non-Win32

[sircus]

On Win32, filesystem::native() correctly checks paths
for validity on Win32.  For other systems, it just
returns true, presumably on the theory that for Unix,
anything goes.  Unless I'm much mistaken though, the
character '/' is not allowed in Unix filenames.  As
such, native() should be changed as follows:

BOOST_FILESYSTEM_DECL bool native( const std::string
&name )
{
  return name.find('/') == std::string::npos;
}

[beman_dawes]

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user_id=51042

Fixed in both head and i18n branch.

Thanks for the report.