logpolicy: add -race suffix to Go version when race detector in use

cmd/tailscaled/depaware.txt

@@ -87,6 +87,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    W    tailscale.com/util/endian                                    from tailscale.com/net/netns+
         tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
         tailscale.com/util/pidowner                                  from tailscale.com/ipn/ipnserver
+        tailscale.com/util/racebuild                                 from tailscale.com/logpolicy
         tailscale.com/version                                        from tailscale.com/cmd/tailscaled+
         tailscale.com/version/distro                                 from tailscale.com/control/controlclient+
         tailscale.com/wgengine                                       from tailscale.com/cmd/tailscaled+

logpolicy/logpolicy.go

@@ -35,6 +35,7 @@ import (
 	"tailscale.com/paths"
 	"tailscale.com/smallzstd"
 	"tailscale.com/types/logger"
+	"tailscale.com/util/racebuild"
 	"tailscale.com/version"
 )
 
@@ -396,7 +397,7 @@ func New(collection string) *Policy {
 
 	log.Printf("Program starting: v%v, Go %v: %#v",
 		version.Long,
-		strings.TrimPrefix(runtime.Version(), "go"),
+		goVersion(),
 		os.Args)
 	log.Printf("LogID: %v", newc.PublicID)
 	if filchErr != nil {
@@ -479,3 +480,11 @@ func newLogtailTransport(host string) *http.Transport {
 
 	return tr
 }
+
+func goVersion() string {
+	v := strings.TrimPrefix(runtime.Version(), "go")
+	if racebuild.On {
+		return v + "-race"
+	}
+	return v
+}