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Since ABI 24, we can read from the target file connected to a
proxy. The EVL_CLONE_INPUT, EVL_CLONE_OUTPUT creation flags select the
direction (may be combined for a single proxy instance).

The evl_new_proxy() short call form sticks with the original behavior,
creating an output-only proxy. There is actually no change needed to
libevl in order to enable this feature. Just add a test for peace of
mind.
Signed-off-by: Philippe Gerum <rpm@xenomai.org>