[Piglit] [PATCH V2 5/8] arb_texture_multisample: new tests for sample mask

[Chris Forbes]

+    config.window_width = 64;
+    config.window_height = 64;
+    config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_ALPHA;

Sorry, more leftover junk here... the default size is big enough, and
I really meant RGBA|DOUBLE.