Add patches for eLinux.

Change-Id: I31d023c857fd45d54500670d4c7ce473442afd40
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>
Add proxy functions for libc symbols to allow sandboxing.

These functions override symbols exported by libc,
such as fopen, localtime and similar and call the
exported _override function in QtWebEngineCore.
This code should live in an executable,
but never in a library as it causes erratic behavior
depending on the linking order.

With this change we now also update the submodule
shasum for the 3rdparty submodule to point to a commit
that includes the patches for eLinux.

Change-Id: I88f32c615181eefff2b38b374eed6f57c677d186
Reviewed-by: Zeno Albisser <zeno.albisser@digia.com>