webkitgtk: Add patches which allow building for ARMv8-A

webkitgtk: Add patches which allow building for ARMv8-A

The two added patches allow building WebKitGTK+ when the compiler
scpecifically targets ARMv8-A, and reports as such be pre-defining
__ARCH_ARM_8A__ instead of just __ARCH_ARM_8__. Both patches were
pulled from the corresponding upstream bug reports and edited to
remove the conflicting parts which edit the ChangeLog files.

Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>