svga: fill out CAPs for indirect addressing

As per the ps_3_0 and vs_3_0 documentation.
The aL register in D3D9 is quite tricky to use, though.
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index b5fae94..af99c41 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -231,6 +231,12 @@
          return svgascreen->use_ps30 ? 1 : 0;
       case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
          return 1;
+      case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
+         return svgascreen->use_ps30 ? 1 : 0;
+      case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
+      case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
+      case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
+         return 0;
       }
       break;
    case PIPE_SHADER_VERTEX:
@@ -263,6 +269,13 @@
          return svgascreen->use_vs30 ? 1 : 0;
       case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
          return 1;
+      case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
+      case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
+         return svgascreen->use_vs30 ? 1 : 0;
+      case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
+         return 0;
+      case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
+         return 1;
       default:
          break;
       }