meson: fix missing dependencies

Building in subproject wrap mode reveals missing dependencies.
Add them as necessary.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I883df9770661f3a859a5eb9d16cdd022227cd324
diff --git a/test/meson.build b/test/meson.build
index a62b263..a8cb358 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -36,6 +36,7 @@
                                     gmock_dep,
                                     dump,
                                     phosphor_logging_dep,
+                                    cereal_dep,
                                     ]),
        workdir: meson.current_source_dir())
 endforeach