configs/qemu_ppc_mac99: needs host-openssl

The kernel configuration used by the qemu_ppc_mac99_defconfig needs
host-openssl, otherwise it fails to build with:

  scripts/extract-cert.c:21:25: fatal error: openssl/bio.h: No such file or directory

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/269139257

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/qemu_ppc_mac99_defconfig

@@ -9,6 +9,7 @@ BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.2.4"
 BR2_LINUX_KERNEL_DEFCONFIG="pmac32"
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/qemu/ppc-mac99/linux.fragment"
 BR2_LINUX_KERNEL_VMLINUX=y
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set