cmd/age,cmd/age-keygen: remove unnecessary injected Version

golang/go#50603 started stamping the VCS tag version.

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
           DIR="$(mktemp -d)"
           mkdir "$DIR/age"
           cp "$RUNNER_TEMP/LICENSE" "$DIR/age"
-          go build -o "$DIR/age" -ldflags "-X main.Version=$VERSION" -trimpath ./cmd/...
+          go build -o "$DIR/age" -trimpath ./cmd/...
           if [ "$GOOS" == "windows" ]; then
             sudo apt-get update && sudo apt-get install -y osslsigncode
             if [ -n "${{ secrets.SIGN_PASS }}" ]; then

cmd/age-keygen/keygen.go

@@ -48,11 +48,6 @@ Examples:
     $ age-keygen -y key.txt
     age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p`
 
-// Version can be set at link time to override debug.BuildInfo.Main.Version,
-// which is "(devel)" when building from within the module. See
-// golang.org/issue/29814 and golang.org/issue/29228.
-var Version string
-
 func main() {
 	log.SetFlags(0)
 	flag.Usage = func() { fmt.Fprintf(os.Stderr, "%s\n", usage) }
@@ -74,10 +69,6 @@ func main() {
 		errorf("too many arguments")
 	}
 	if versionFlag {
-		if Version != "" {
-			fmt.Println(Version)
-			return
-		}
 		if buildInfo, ok := debug.ReadBuildInfo(); ok {
 			fmt.Println(buildInfo.Main.Version)
 			return

cmd/age/age.go

@@ -63,11 +63,6 @@ Example:
     $ tar cvz ~/data | age -r age1ql3z7hjy54pw3hyww5ayyfg7zqgvc7w3j2elw8zmrj2kg5sfn9aqmcac8p > data.tar.gz.age
     $ age --decrypt -i key.txt -o data.tar.gz data.tar.gz.age`
 
-// Version can be set at link time to override debug.BuildInfo.Main.Version,
-// which is "(devel)" when building from within the module. See
-// golang.org/issue/29814 and golang.org/issue/29228.
-var Version string
-
 // stdinInUse is used to ensure only one of input, recipients, or identities
 // file is read from stdin. It's a singleton like os.Stdin.
 var stdinInUse bool
@@ -137,10 +132,6 @@ func main() {
 	flag.Parse()
 
 	if versionFlag {
-		if Version != "" {
-			fmt.Println(Version)
-			return
-		}
 		if buildInfo, ok := debug.ReadBuildInfo(); ok {
 			// TODO: use buildInfo.Settings to prepare a pseudoversion such as
 			// v0.0.0-20210817164053-32db794688a5+dirty on Go 1.18+.