Remove timestamp from version command

This enables reproducible builds, for details see
https://reproducible-builds.org/docs/timestamps/

src/cmds/restic/cmd_version.go

@@ -15,8 +15,8 @@ The "version" command prints detailed information about the build environment
 and the version of this software.
 `,
 	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Printf("restic %s\ncompiled at %s with %v on %v/%v\n",
-			version, compiledAt, runtime.Version(), runtime.GOOS, runtime.GOARCH)
+		fmt.Printf("restic %s\ncompiled with %v on %v/%v\n",
+			version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
 	},
 }
 

src/cmds/restic/global.go

@@ -26,7 +26,6 @@ import (
 )
 
 var version = "compiled manually"
-var compiledAt = "unknown time"
 
 func parseEnvironment(cmd *cobra.Command, args []string) {
 	repo := os.Getenv("RESTIC_REPOSITORY")