Always do either FULL or NO acceleration for Windows OpenGL.

Don't ever leave it to the OS to decide, because older ATI drivers apparently
 break in this case, and generally apps want FULL by default anyhow.

src/video/wincommon/SDL_wingl.c

@@ -226,7 +226,18 @@ int WIN_GL_SetupWindow(_THIS)
 	*iAttr++ = this->gl_config.green_size;
 	*iAttr++ = WGL_BLUE_BITS_ARB;
 	*iAttr++ = this->gl_config.blue_size;
-
+
+	/* We always choose either FULL or NO accel on Windows, because of flaky
+	   drivers. If the app didn't specify, we use FULL, because that's
+	   probably what they wanted (and if you didn't care and got FULL, that's
+	   a perfectly valid result in any case. */
+	*iAttr++ = WGL_ACCELERATION_ARB;
+	if (this->gl_config.accelerated) {
+		*iAttr++ = WGL_FULL_ACCELERATION_ARB;
+	} else {
+		*iAttr++ = WGL_NO_ACCELERATION_ARB;
+	}
+
 	if ( this->gl_config.alpha_size ) {
 		*iAttr++ = WGL_ALPHA_BITS_ARB;
 		*iAttr++ = this->gl_config.alpha_size;
@@ -278,11 +289,6 @@ int WIN_GL_SetupWindow(_THIS)
 		*iAttr++ = this->gl_config.multisamplesamples;
 	}
 
-	if ( this->gl_config.accelerated >= 0 ) {
-		*iAttr++ = WGL_ACCELERATION_ARB;
-		*iAttr++ = (this->gl_config.accelerated ? WGL_FULL_ACCELERATION_ARB : WGL_NO_ACCELERATION_ARB);
-	}
-
 	*iAttr = 0;
 
 	for ( i=0; ; ++i ) {