multi: add golang 1.17 compatible build tags

With go 1.17 a change to the build flags was implemented:
https://go.googlesource.com/proposal/+/master/design/draft-gobuild.md

The formatter now automatically adds the forward-compatible build tag
format and the linter checks for them, so we need to include them in our
code.

build/deployment_dev.go

@@ -1,3 +1,4 @@
+//go:build dev
 // +build dev
 
 package build

build/deployment_prod.go

@@ -1,3 +1,4 @@
+//go:build !dev
 // +build !dev
 
 package build

build/log_default.go

@@ -1,3 +1,4 @@
+//go:build !stdlog && !nolog
 // +build !stdlog,!nolog
 
 package build

build/log_nolog.go

@@ -1,3 +1,4 @@
+//go:build nolog
 // +build nolog
 
 package build

build/log_stdlog.go

@@ -1,3 +1,4 @@
+//go:build stdlog
 // +build stdlog
 
 package build

build/loglevel_critical.go

@@ -1,3 +1,4 @@
+//go:build dev && critical
 // +build dev,critical
 
 package build

build/loglevel_debug.go

@@ -1,3 +1,4 @@
+//go:build dev && debug
 // +build dev,debug
 
 package build

build/loglevel_default.go

@@ -1,3 +1,4 @@
+//go:build !info && !debug && !trace && !warn && !error && !critical && !off
 // +build !info,!debug,!trace,!warn,!error,!critical,!off
 
 package build

build/loglevel_error.go

@@ -1,3 +1,4 @@
+//go:build dev && error
 // +build dev,error
 
 package build

build/loglevel_info.go

@@ -1,3 +1,4 @@
+//go:build dev && info
 // +build dev,info
 
 package build

build/loglevel_off.go

@@ -1,3 +1,4 @@
+//go:build dev && off
 // +build dev,off
 
 package build

build/loglevel_trace.go

@@ -1,3 +1,4 @@
+//go:build dev && trace
 // +build dev,trace
 
 package build

build/loglevel_warn.go

@@ -1,3 +1,4 @@
+//go:build dev && warn
 // +build dev,warn
 
 package build