libwebsockets

timeout settable from info

This adds an info member that allows the user code to
set the library's network action timeout in seconds.

If left at the default 0, the build-time default
AWAITING_TIMEOUT continues to be used.

As suggested

https://github.com/warmcat/libwebsockets/issues/427

Signed-off-by: Andy Green <andy.green@linaro.org>