util: add API for reading password from the console
This imports a simpler version of GNULIB's getpass() function impl for Windows. Note that GNULIB's impl was buggy as it returned a static string on UNIX, and a heap allocated string on Windows. This new impl always heap allocates. Reviewed-by: NPavel Hrdina <phrdina@redhat.com> Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>
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