Remove ctx->Point._Size and ctx->Line._Width.

The clamping for these values depends on whether we're drawing AA or non-AA
points, lines.  Defer clamping until drawing time.  Drivers could compute and
keep clamped AA and clamped non-AA values if desired.
diff --git a/src/mesa/swrast/s_aalinetemp.h b/src/mesa/swrast/s_aalinetemp.h
index 69a1f0c..e7911fe 100644
--- a/src/mesa/swrast/s_aalinetemp.h
+++ b/src/mesa/swrast/s_aalinetemp.h
@@ -132,7 +132,9 @@
    line.dx = line.x1 - line.x0;
    line.dy = line.y1 - line.y0;
    line.len = SQRTF(line.dx * line.dx + line.dy * line.dy);
-   line.halfWidth = 0.5F * ctx->Line._Width;
+   line.halfWidth = 0.5F * CLAMP(ctx->Line.Width,
+                                 ctx->Const.MinLineWidthAA,
+                                 ctx->Const.MaxLineWidthAA);
 
    if (line.len == 0.0 || IS_INF_OR_NAN(line.len))
       return;