os/user: simplify go:build

The go:build constraint for these files is way too complicated,
and can be simplified by using unix tag.

Change-Id: Id8278db0ba799a4e951d3c976f77c7402bebb332
Reviewed-on: https://go-review.googlesource.com/c/go/+/703155
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: Mark Freeman <[email protected]>
Reviewed-by: Michael Knyszek <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: kolyshkin

src/os/user/cgo_listgroups_unix.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.
 
-//go:build (cgo || darwin) && !osusergo && (darwin || dragonfly || freebsd || (linux && !android) || netbsd || openbsd || solaris)
+//go:build (cgo || darwin) && !osusergo && unix && !android && !aix
 
 package user
 

src/os/user/getgrouplist_unix.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.
 
-//go:build cgo && !osusergo && (dragonfly || freebsd || (!android && linux) || netbsd || openbsd || solaris)
+//go:build cgo && !osusergo && unix && !android && !aix && !darwin
 
 package user
 

src/os/user/listgroups_unix.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.
 
-//go:build ((darwin || dragonfly || freebsd || (js && wasm) || wasip1 || (!android && linux) || netbsd || openbsd || solaris) && ((!cgo && !darwin) || osusergo)) || aix
+//go:build (((unix && !android) || (js && wasm) || wasip1) && ((!cgo && !darwin) || osusergo)) || aix
 
 package user
 

src/os/user/listgroups_unix_test.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.
 
-//go:build ((darwin || dragonfly || freebsd || (js && wasm) || wasip1 || (!android && linux) || netbsd || openbsd || solaris) && ((!cgo && !darwin) || osusergo)) || aix
+//go:build (((unix && !android) || (js && wasm) || wasip1) && ((!cgo && !darwin) || osusergo)) || aix
 
 package user