[webkit-efl] Bump Ubuntu version from 14.04 to 14.10 for EFL port

[Gyuyoung Kim]

Hello EFL folks,

Recently some patches only can be built in gcc version 4.9 or later. For
example AsyncTask.h uses lambdas function supported from gcc 4.9 ver.

    AsyncTaskImpl(T* callee, void (T::*method)(Arguments...),
Arguments&&... arguments)
    {
        m_taskFunction = [callee, method, arguments...] {
            (callee->*method)(arguments...);
        };
    }

If there is no object to bump Ubuntu version, I'm going to upgrade it on
EFL buildbot and ews.

Gyuyoung
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