configs/qemu_pcc_mac99: build host-qemu for runtime testing

The commit [1] added host-qemu package for each qemu defconfig
for gitlab runtime testing.

[1] 29e1cb88844614c40846540e22cf83aa9e52674f

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Cc: Joel Stanley <joel@jms.id.au>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/qemu_ppc_mac99_defconfig

@@ -24,3 +24,7 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"
 BR2_TARGET_ROOTFS_CPIO=y
 BR2_TARGET_ROOTFS_EXT2=y
 # BR2_TARGET_ROOTFS_TAR is not set
+
+# host-qemu for gitlab testing
+BR2_PACKAGE_HOST_QEMU=y
+BR2_PACKAGE_HOST_QEMU_SYSTEM_MODE=y