nir/spirv: Allow the clip distance capability.

src/compiler/nir/spirv/spirv_to_nir.c

@@ -2153,6 +2153,7 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
       case SpvCapabilityMatrix:
       case SpvCapabilityShader:
       case SpvCapabilityGeometry:
+      case SpvCapabilityClipDistance:
          break;
       default:
          assert(!"Unsupported capability");