ddraw/tests: Skip the primary palette tests if the 640x480x8 mode is not supported.

dlls/ddraw/tests/ddraw1.c

@@ -4078,6 +4078,12 @@ static void test_primary_palette(void)
     window = CreateWindowA("static", "ddraw_test", WS_OVERLAPPEDWINDOW,
             0, 0, 640, 480, 0, 0, 0, 0);
     hr = IDirectDraw_SetDisplayMode(ddraw, 640, 480, 8);
+    if (hr == E_NOTIMPL)
+    {
+        win_skip("8bpp display mode is not supported\n");
+        DestroyWindow(window);
+        return;
+    }
     ok(SUCCEEDED(hr), "Failed to set display mode, hr %#x.\n", hr);
     hr = IDirectDraw_SetCooperativeLevel(ddraw, window, DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN);
     ok(SUCCEEDED(hr), "Failed to set cooperative level, hr %#x.\n", hr);

dlls/ddraw/tests/ddraw2.c

@@ -5175,6 +5175,12 @@ static void test_primary_palette(void)
     window = CreateWindowA("static", "ddraw_test", WS_OVERLAPPEDWINDOW,
             0, 0, 640, 480, 0, 0, 0, 0);
     hr = IDirectDraw2_SetDisplayMode(ddraw, 640, 480, 8, 0, 0);
+    if (hr == E_NOTIMPL)
+    {
+        win_skip("8bpp display mode is not supported\n");
+        DestroyWindow(window);
+        return;
+    }
     ok(SUCCEEDED(hr), "Failed to set display mode, hr %#x.\n", hr);
     hr = IDirectDraw2_SetCooperativeLevel(ddraw, window, DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN);
     ok(SUCCEEDED(hr), "Failed to set cooperative level, hr %#x.\n", hr);

dlls/ddraw/tests/ddraw4.c

@@ -5772,6 +5772,12 @@ static void test_primary_palette(void)
             0, 0, 640, 480, 0, 0, 0, 0);
     hr = IDirectDraw4_SetDisplayMode(ddraw, 640, 480, 8, 0, 0);
     ok(SUCCEEDED(hr), "Failed to set display mode, hr %#x.\n", hr);
+    if (hr == E_NOTIMPL)
+    {
+        win_skip("8bpp display mode is not supported\n");
+        DestroyWindow(window);
+        return;
+    }
     hr = IDirectDraw4_SetCooperativeLevel(ddraw, window, DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN);
     ok(SUCCEEDED(hr), "Failed to set cooperative level, hr %#x.\n", hr);