i965: allow larger AA points on fallback path

src/mesa/drivers/dri/i965/brw_context.c

@@ -143,6 +143,9 @@ GLboolean brwCreateContext( const __GLcontextModes *mesaVis,
    ctx->Const.MaxCubeTextureLevels = 12;
    ctx->Const.MaxTextureRectSize = (1<<11);
    
+   /* if conformance mode is set, swrast can handle any size AA point */
+   ctx->Const.MaxPointSizeAA = 255.0;
+
 /*    ctx->Const.MaxNativeVertexProgramTemps = 32; */
 
    brw_init_attribs( brw );