ddraw/tests: fix a few compiler warnings on clang

[Austin English]

E.g., visual.c:727:14: warning: passing 'float const [4][5]' discards
qualifiers, expected 'LPVOID' (aka 'void *') [-pedantic]

-- 
-Austin
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diff --git a/dlls/ddraw/tests/visual.c b/dlls/ddraw/tests/visual.c
index e668691..2737a36 100644
--- a/dlls/ddraw/tests/visual.c
+++ b/dlls/ddraw/tests/visual.c
@@ -672,7 +672,7 @@ static void offscreen_test(IDirect3DDevice7 *device)
     DWORD color;
     DDSURFACEDESC2 ddsd;
 
-    static const float quad[][5] = {
+    static float quad[][5] = {
         {-0.5f, -0.5f, 0.1f, 0.0f, 0.0f},
         {-0.5f,  0.5f, 0.1f, 0.0f, 1.0f},
         { 0.5f, -0.5f, 0.1f, 1.0f, 0.0f},
@@ -795,7 +795,7 @@ static void alpha_test(IDirect3DDevice7 *device)
         { 1.0f,  0.0f,   0.1f,                          0xc00000ff},
         { 1.0f,  1.0f,   0.1f,                          0xc00000ff},
     };
-    static const float composite_quad[][5] = {
+    static float composite_quad[][5] = {
         { 0.0f, -1.0f, 0.1f, 0.0f, 1.0f},
         { 0.0f,  1.0f, 0.1f, 0.0f, 0.0f},
         { 1.0f, -1.0f, 0.1f, 1.0f, 1.0f},