remove not needed startup_helpers.rs

lib/src/lightwallet/startup_helpers.rs

@@ -1,20 +0,0 @@
-pub fn report_permission_error() {
-    let user = std::env::var("USER").expect(
-        "Unexpected error reading value of $USER!");
-    let home = std::env::var("HOME").expect(
-        "Unexpected error reading value of $HOME!");
-    let current_executable = std::env::current_exe()
-        .expect("Unexpected error reporting executable path!");
-    eprintln!("USER: {}", user);
-    eprintln!("HOME: {}", home);
-    eprintln!("Executable: {}", current_executable.display());
-    if home == "/" {
-        eprintln!("User {} must have permission to write to '{}silentdragonlite/' .",
-                  user,
-                  home);
-    } else {
-        eprintln!("User {} must have permission to write to '{}/silentdragonlite/ .",
-                  user,
-                  home);
-    }
-}