examples/mdns_test: fix link error
examples/mdns_test: fix link error

This patch adds "#include <stdlib.h>" in order to fix the following
link error.

  mdns_main.c:206: undefined reference to `atoi'

Change-Id: I4a8efdecfdfc2dd8736f9754557e87db854d5a65
Signed-off-by: Wonsang Ryou <bc48fb2bc21aa3a9d3ccd13729d9fc0f5ca913dd@samsung.com>

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