misc: drop Build variable

Makes builds reproducible.

Signed-off-by: Roman Khimov <roman@nspcc.ru>

Makefile

@@ -22,8 +22,7 @@ $(BINS): $(DIRS) dep
 	CGO_ENABLED=0 \
 	GO111MODULE=on \
 	go build -v -trimpath \
-	-ldflags "-X main.Version=$(VERSION) \
-	-X main.Build=$(BUILD)" \
+	-ldflags "-X main.Version=$(VERSION)" \
 	-o $@ ./
 
 $(DIRS):

misc.go

@@ -5,8 +5,6 @@ package main
 const Prefix = "HTTP_GW"
 
 var (
-	// Build is a timestamp set during gateway build.
-	Build = "now"
 	// Version is gateway version.
 	Version = "dev"
 )

settings.go

@@ -66,7 +66,6 @@ const (
 	// Application.
 	cfgApplicationName    = "app.name"
 	cfgApplicationVersion = "app.version"
-	cfgApplicationBuildTime = "app.build_time"
 
 	// Command line args.
 	cmdHelp     = "help"
@@ -80,7 +79,6 @@ const (
 var ignore = map[string]struct{}{
 	cfgApplicationName:    {},
 	cfgApplicationVersion: {},
-	cfgApplicationBuildTime: {},
 	cfgPeers:              {},
 	cmdHelp:               {},
 	cmdVersion:            {},
@@ -164,7 +162,7 @@ func settings() *viper.Viper {
 
 	switch {
 	case help != nil && *help:
-		fmt.Printf("NeoFS HTTP Gateway %s (%s)\n", Version, Build)
+		fmt.Printf("NeoFS HTTP Gateway %s\n", Version)
 		flags.PrintDefaults()
 
 		fmt.Println()
@@ -191,7 +189,7 @@ func settings() *viper.Viper {
 
 		os.Exit(0)
 	case version != nil && *version:
-		fmt.Printf("NeoFS HTTP Gateway %s (%s)\n", Version, Build)
+		fmt.Printf("NeoFS HTTP Gateway %s\n", Version)
 		os.Exit(0)
 	}