Merge pull request #39994 from tiborvass/homedir-buildtags

homedir: add cgo or osusergo buildtag constraints for unix

pkg/homedir/homedir_unix.go

@@ -1,4 +1,4 @@
-// +build !windows
+// +build !windows,cgo !windows,osusergo
 
 package homedir // import "github.com/docker/docker/pkg/homedir"