configs/qemu_aarch64_virt: needs host-openssl for the Linux kernel build

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/59015465

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/qemu_aarch64_virt_defconfig

@@ -19,3 +19,4 @@ BR2_LINUX_KERNEL_CUSTOM_VERSION=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.15.2"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
 BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/qemu/aarch64-virt/linux-4.15.config"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y