qtest: add display-vga-test to ppc64

Only enable for ppc64 in the Makefile, but added
code in the file to check cirrus card only on architectures
supporting it (alpha, mips, i386, x86_64).

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Tested-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
diff --git a/tests/display-vga-test.c b/tests/display-vga-test.c
index 9146021..2d7d24e 100644
--- a/tests/display-vga-test.c
+++ b/tests/display-vga-test.c
@@ -50,9 +50,14 @@
 
 int main(int argc, char **argv)
 {
+    const char *arch = qtest_get_arch();
+
     g_test_init(&argc, &argv, NULL);
 
-    qtest_add_func("/display/pci/cirrus", pci_cirrus);
+    if (strcmp(arch, "alpha") == 0 || strcmp(arch, "i386") == 0 ||
+        strcmp(arch, "mips") == 0 || strcmp(arch, "x86_64") == 0) {
+        qtest_add_func("/display/pci/cirrus", pci_cirrus);
+    }
     qtest_add_func("/display/pci/stdvga", pci_stdvga);
     qtest_add_func("/display/pci/secondary", pci_secondary);
     qtest_add_func("/display/pci/multihead", pci_multihead);