tests: Fix call-with-io deadlock.
* tests/gpgscm/ffi.c (es_wrap): Ifdef-out. [HAVE_W32_SYSTEM] (read_from_pipe): New. (do_process_spawn_io): Rename from do_process_spawn. Do I/O with no deadlock. * tests/gpgscm/tests.scm (call-with-io): Use process-spawn-io. (es-read-all): Remove.
- GnuPG-bug-id: T6523
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>