all: update build constraints to Go 1.17

Do it all at once in preparation for Go 1.18 support.

To make this commit, I've simply modified the `fmt-check` Makefile
target to rewrite files instead of listing the differences. So this is a
fully mechanical change, it should not have introduced any errors.

src/os/stat_other.go

@@ -1,4 +1,5 @@
-//  +build baremetal wasm,!wasi
+//go:build baremetal || (wasm && !wasi)
+// +build baremetal wasm,!wasi
 
 // Copyright 2016 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style