[cleanup] Remove unnecessary stub file

This file exists because at some point, some foo_unix.go had a
`+build: fuchsia` and also imported internal/syscall/unix which built
nothing for Fuchsia. Now there's the nonblocking_fuchsia.go, which
causes this to be built. In the future, this will probably be moved
elsewhere, and whatever foo_unix.go that is doing this will end up being
separated.

Change-Id: I3268b8683212f6c8b57f27e992d593b7a2f0fc01
diff --git a/src/internal/syscall/unix/stub_fuchsia.go b/src/internal/syscall/unix/stub_fuchsia.go
deleted file mode 100644
index 2d7b8de..0000000
--- a/src/internal/syscall/unix/stub_fuchsia.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2014 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// This file exists to make the go tool happy.
-
-package unix