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w32: Make pipes really pollable.
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Description

w32: Make pipes really pollable.

* common/exectool.c (gnupg_exec_tool_stream) [W32]: Use _get_osfhandle
to print the fd for the command line.
* common/exechelp-w32.c (create_pipe_and_estream): Use es_sysopen so
that the streams are actually pollable.

This addresses two bugs:

Using the "-&@INEXTRA@" kludges requires that we pass the value of the handle on the command line and not the libc fd.
gpgrt_poll requires the use of the ReadFile/WriteFile backend which is currently only used when the stream has been created with gpgrt_sysopen.