buildroot

swig: enable support for Node.js >= 7.x

Recent Node.js versions have removed some depreciated API calls,
that swig still relies on. Patches taken from this PR [1] fix
this issue.

[1] https://github.com/swig/swig/pull/968

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>