remove dead code

weed/command/mount_notsupported.go

@@ -0,0 +1,15 @@
+//go:build !linux && !darwin
+// +build !linux,!darwin
+
+package command
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func runMount(cmd *Command, args []string) bool {
+	fmt.Printf("Mount is not supported on %s %s\n", runtime.GOOS, runtime.GOARCH)
+
+	return true
+}