unix: add //go:build lines to assembly files

The zsyscall_darwin*.s files were regenerated using mksyscall.go. The
rest were updated manually, go fmt doesn't support formatting assembly
files.

Change-Id: I5efa23cb988300257de6bba4769e78c49a6382f1
Reviewed-on: https://go-review.googlesource.com/c/sys/+/312411
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

unix/asm_aix_ppc64.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build gc
 // +build gc
 
 #include "textflag.h"

unix/asm_linux_386.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build gc
 // +build gc
 
 #include "textflag.h"

unix/asm_linux_amd64.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build gc
 // +build gc
 
 #include "textflag.h"

unix/asm_linux_arm.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build gc
 // +build gc
 
 #include "textflag.h"

unix/asm_linux_arm64.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux && arm64 && gc
 // +build linux
 // +build arm64
 // +build gc

unix/asm_linux_mips64x.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux && (mips64 || mips64le) && gc
 // +build linux
 // +build mips64 mips64le
 // +build gc

unix/asm_linux_mipsx.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux && (mips || mipsle) && gc
 // +build linux
 // +build mips mipsle
 // +build gc

unix/asm_linux_ppc64x.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux && (ppc64 || ppc64le) && gc
 // +build linux
 // +build ppc64 ppc64le
 // +build gc

unix/asm_linux_riscv64.s

@@ -2,7 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build riscv64,gc
+//go:build riscv64 && gc
+// +build riscv64
+// +build gc
 
 #include "textflag.h"
 

unix/asm_linux_s390x.s

@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build s390x
+//go:build linux && s390x && gc
 // +build linux
+// +build s390x
 // +build gc
 
 #include "textflag.h"

unix/asm_openbsd_mips64.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build gc
 // +build gc
 
 #include "textflag.h"

unix/asm_solaris_amd64.s

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build gc
 // +build gc
 
 #include "textflag.h"

unix/zsyscall_darwin_386.1_13.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go 386
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.13
 // +build go1.13
 
 #include "textflag.h"

unix/zsyscall_darwin_386.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go 386
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.12
 // +build go1.12
 
 #include "textflag.h"

unix/zsyscall_darwin_amd64.1_13.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go amd64
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.13
 // +build go1.13
 
 #include "textflag.h"

unix/zsyscall_darwin_amd64.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go amd64
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.12
 // +build go1.12
 
 #include "textflag.h"

unix/zsyscall_darwin_arm.1_13.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go arm
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.13
 // +build go1.13
 
 #include "textflag.h"

unix/zsyscall_darwin_arm.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go arm
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.12
 // +build go1.12
 
 #include "textflag.h"

unix/zsyscall_darwin_arm64.1_13.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go arm64
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.13
 // +build go1.13
 
 #include "textflag.h"

unix/zsyscall_darwin_arm64.s

@@ -1,6 +1,7 @@
 // go run mkasm_darwin.go arm64
 // Code generated by the command above; DO NOT EDIT.
 
+//go:build go1.12
 // +build go1.12
 
 #include "textflag.h"