[PATCH GOLD] [6/N mingw host] Add support for not keeping the files open on execute

[Andrew Pinski <Andrew_Pinski at playstation dot sony dot com>]

Hi,
  On mingw, FD_CLOEXEC does not exist but we can use the Win32 APIs to
say we don't want the file to be inherited on execute.

This is the first patch which I could not figure out how to do without
a #ifdef _WIN32.

Built and tested on i686-linux-gnu including with the LTO plugin.

Thanks,
Andrew Pinski

ChangeLog:

* descriptors.cc: Include windows.h on Win32 hosts.
(Descriptors::open): Use SetHandleInformation with HANDLE_FLAG_INHERIT
instead of calling fcntl with FD_CLOEXEC.

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