hw/s390x: only build tod-tcg from the CONFIG_TCG build

this will allow in later patches to remove unneeded stubs
in target/s390x.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Signed-off-by: Cho, Yu-Chen <acho@suse.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210707105324.23400-5-acho@suse.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

hw/s390x/meson.build

@@ -16,7 +16,6 @@ s390x_ss.add(files(
   'sclp.c',
   'sclpcpu.c',
   'sclpquiesce.c',
-  'tod-tcg.c',
   'tod.c',
 ))
 s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
@@ -25,6 +24,9 @@ s390x_ss.add(when: 'CONFIG_KVM', if_true: files(
   's390-stattrib-kvm.c',
   'pv.c',
 ))
+s390x_ss.add(when: 'CONFIG_TCG', if_true: files(
+  'tod-tcg.c',
+))
 s390x_ss.add(when: 'CONFIG_S390_CCW_VIRTIO', if_true: files('s390-virtio-ccw.c'))
 s390x_ss.add(when: 'CONFIG_TERMINAL3270', if_true: files('3270-ccw.c'))
 s390x_ss.add(when: 'CONFIG_VFIO', if_true: files('s390-pci-vfio.c'))