d3d8: Skip volume test if volume textures are not supported.

dlls/d3d8/tests/volume.c

@@ -125,6 +125,7 @@ START_TEST(volume)
 {
     HMODULE d3d8_handle;
     IDirect3DDevice8 *device_ptr;
+    D3DCAPS8 caps;
 
     d3d8_handle = LoadLibraryA("d3d8.dll");
     if (!d3d8_handle)
@@ -136,5 +137,11 @@ START_TEST(volume)
     device_ptr = init_d3d8(d3d8_handle);
     if (!device_ptr) return;
 
+    IDirect3DDevice8_GetDeviceCaps(device_ptr, &caps);
+    if(!(caps.TextureCaps & D3DPTEXTURECAPS_VOLUMEMAP)) {
+        skip("Volume textures not supported\n");
+        return;
+    }
+
     test_volume_get_container(device_ptr);
 }