tests: Add capabilities data for QEMU 4.0.0 x86_64

The next release of QEMU is going to be 4.0.0. A bit early, but
this adds capabilities data for x86_64 from current qemu git
15bede554162dda822cd762c689edb6fa32b6e3b
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>

tests/qemucapabilitiestest.c

@@ -179,6 +179,7 @@ mymain(void)
     DO_TEST("x86_64", "caps_2.12.0");
     DO_TEST("x86_64", "caps_3.0.0");
     DO_TEST("x86_64", "caps_3.1.0");
+    DO_TEST("x86_64", "caps_4.0.0");
     DO_TEST("aarch64", "caps_2.6.0");
     DO_TEST("aarch64", "caps_2.10.0");
     DO_TEST("aarch64", "caps_2.12.0");