vendor: Update golang.org/x/sys/unix

vendor/golang.org/x/sys/unix/endian_big.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 //
-// +build ppc64 s390x mips64
+// +build ppc64 s390x mips mips64
 
 package unix
 

vendor/golang.org/x/sys/unix/endian_little.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 //
-// +build 386 amd64 amd64p32 arm arm64 ppc64le mips64le
+// +build 386 amd64 amd64p32 arm arm64 ppc64le mipsle mips64le
 
 package unix
 

vendor/manifest

@@ -596,7 +596,7 @@
 			"importpath": "golang.org/x/sys/unix",
 			"repository": "https://go.googlesource.com/sys",
 			"vcs": "git",
-			"revision": "493114f68206f85e7e333beccfabc11e98cba8dd",
+			"revision": "f3918c30c5c2cb527c0b071a27c35120a6c0719a",
 			"branch": "master",
 			"path": "unix",
 			"notests": true