message: add #[no_mangle] flag for signus.rs methods
diff: @@ -34,6 +34,7 @@ use self::libc::c_char;
  /// Common*
  /// Wallet*
  /// Crypto*
  +#[no_mangle]
  pub extern fn sovrin_create_and_store_my_did(command_handle: i32,
  wallet_handle: i32,
  did_json: *const c_char,
  @@ -81,6 +82,7 @@ pub extern fn sovrin_create_and_store_my_did(command_handle: i32,
  /// Common*
  /// Wallet*
  /// Crypto*
  +#[no_mangle]
  pub extern fn sovrin_replace_keys(command_handle: i32,
  wallet_handle: i32,
  did: *const c_char,
  @@ -129,6 +131,7 @@ pub extern fn sovrin_replace_keys(command_handle: i32,
  /// Common*
  /// Wallet*
  /// Crypto*
  +#[no_mangle]
  pub extern fn sovrin_store_their_did(command_handle: i32,
  wallet_handle: i32,
  identity_json: *const c_char,
  @@ -166,6 +169,7 @@ pub extern fn sovrin_store_their_did(command_handle: i32,
  /// Common*
  /// Wallet*
  /// Crypto*
  +#[no_mangle]
  pub extern fn sovrin_sign(command_handle: i32,
  wallet_handle: i32,
  did: *const c_char,
  @@ -214,6 +218,7 @@ pub extern fn sovrin_sign(command_handle: i32,
  /// Wallet*
  /// Ledger*
  /// Crypto*
  +#[no_mangle]
  pub extern fn sovrin_verify_signature(command_handle: i32,
  wallet_handle: i32,
  did: *const c_char,
  @@ -263,6 +268,7 @@ pub extern fn sovrin_verify_signature(command_handle: i32,
  /// Wallet*
  /// Ledger*
  /// Crypto*
  +#[no_mangle]
  pub extern fn sovrin_encrypt(command_handle: i32,
  wallet_handle: i32,
  did: *const c_char,
  @@ -306,6 +312,7 @@ pub extern fn sovrin_encrypt(command_handle: i32,
  /// Common*
  /// Wallet*
  /// Crypto*
  +#[no_mangle]
  pub extern fn sovrin_decrypt(command_handle: i32,
  wallet_handle: i32,
  did: *const c_char,
  