gallium/drivers: handle PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED query

Initially, only softpipe/llvmpipe support SQRT.
diff --git a/src/gallium/drivers/radeonsi/radeonsi_pipe.c b/src/gallium/drivers/radeonsi/radeonsi_pipe.c
index cebe9d3..c88a613 100644
--- a/src/gallium/drivers/radeonsi/radeonsi_pipe.c
+++ b/src/gallium/drivers/radeonsi/radeonsi_pipe.c
@@ -462,6 +462,8 @@
 		return 0; /* FIXME */
 	case PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED:
 		return 1;
+	case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
+		return 0;
 	case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
 	case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 	case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR: