Build complains about lots of unitialized fields in TestCase definition,
for instance:

../tests/session.c:276:11: warning: missing initializer for field ‘message’ of ‘TestCase {aka const struct <anonymous>}’ [-Wmissing-field-initializers]
           "spice://[::192.9.5.5]:5910" },
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
../tests/session.c:11:18: note: ‘message’ declared here
     const gchar *message;
                  ^~~~~~~
../tests/session.c:282:11: warning: missing initializer for field ‘unix_path’ of ‘TestCase {aka const struct <anonymous>}’ [-Wmissing-field-initializers]
           "password may be visible in process listings"},
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>