webkit: Fix build in ISO C++ 11 mode

Change-Id: I32b3121ae46678f847dcd74ea74484aaf8f34eaf
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
-fno-strict-aliasing

Change-Id: Ifdce32be210f12459a24c7b63c3aeb6bac4eb495