webkitgtk24: use the correct Config.in option for NEON

webkitgtk24: use the correct Config.in option for NEON

In order to enable JIT support on ARM, webkitgtk24 currently looks at
BR2_ARM_ENABLE_NEON, which is not correct: BR2_ARM_CPU_HAS_NEON should
be used instead.

The BR2_ARM_ENABLE_NEON is only visible for cores that select
BR2_ARM_CPU_MAYBE_HAS_NEON, in order to allow to specify if his
particular SoC has chosen to integrate NEON or not. And if so,
BR2_ARM_CPU_HAS_NEON gets selected.

BR2_ARM_CPU_HAS_NEON is in fact selected in two different ways:

 - Either directly by the CPU core selection, if NEON is mandatory in
   this CPU core.

 - Or by BR2_ARM_ENABLE_NEON, for CPU cores where NEON support is
   optional.

So really, BR2_ARM_CPU_HAS_NEON is what should be used by packages.

Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>