rework build tags for unix request test support code
diff --git a/request-unix.go b/request-unix.go
index d0df30f..1bc6054 100644
--- a/request-unix.go
+++ b/request-unix.go
@@ -1,5 +1,4 @@
-// +build darwin dragonfly freebsd !android,linux netbsd openbsd solaris
-// +build cgo
+// +build !windows
 
 package sftp