net/lwip: change memcmp to use through the predefinition
net/lwip: change memcmp to use through the predefinition

This patch changes memcmp() to MEMCMP() which is defined in
lwip header for compatibility

Change-Id: Ice97e95a365e8cb143a5c5219d6847b53cd71f18
Signed-off-by: jisuu.kim <800dec47d2987cee7cc3d7aee71bc11b56f5042e@samsung.com>

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