remove travis ppc64le CI

.travis.yml

@@ -2,8 +2,6 @@ language: go
 
 jobs:
   include:
-    - arch: ppc64le
-      go: 1.17.x
     - arch: arm64-graviton2
       virt: vm
       os: linux

internal/xor/xor_amd64.s

@@ -1,6 +1,8 @@
 // Copyright 2018 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
+//go:build amd64 && !generic
+// +build amd64,!generic
 
 #include "textflag.h"
 

internal/xor/xor_arm64.s

@@ -1,6 +1,8 @@
 // Copyright 2020 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
+//go:build arm64 && !generic
+// +build arm64,!generic
 
 #include "textflag.h"
 

sm9/gfp_amd64.s

@@ -1,3 +1,4 @@
+//go:build amd64 && !generic
 // +build amd64,!generic
 
 #define storeBlock(a0,a1,a2,a3, r) \

sm9/gfp_arm64.s

@@ -1,3 +1,4 @@
+//go:build arm64 && !generic
 // +build arm64,!generic
 
 #define storeBlock(a0,a1,a2,a3, r) \