pkg-cmake.mk: Set CMAKE_SYSTEM_PROCESSOR_ARM_VARIANT for ARMv8

This is needed for correctly building some CMake-based packages which
use this variable. For example, this is needed for WebKitGTK+ 2.16.x
to build correctly when an ARMv8 target is configured.

Signed-off-by: Adrian Perez de Castro <aperez@igalia.com>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/pkg-cmake.mk

@@ -219,6 +219,8 @@ else ifeq ($(BR2_ARM_CPU_ARMV6),y)
 CMAKE_SYSTEM_PROCESSOR_ARM_VARIANT = armv6
 else ifeq ($(BR2_ARM_CPU_ARMV7A),y)
 CMAKE_SYSTEM_PROCESSOR_ARM_VARIANT = armv7
+else ifeq ($(BR2_ARM_CPU_ARMV8),y)
+CMAKE_SYSTEM_PROCESSOR_ARM_VARIANT = armv8
 endif
 
 ifeq ($(BR2_arm),y)