Move KeyedAccount out of solana-program. Native programs are not supported by solana-program

sdk/program/src/sysvar/rent.rs

@@ -2,11 +2,7 @@
 //!
 pub use crate::rent::Rent;
 
-use crate::{
-    account::{Account, KeyedAccount},
-    instruction::InstructionError,
-    sysvar::Sysvar,
-};
+use crate::{account::Account, sysvar::Sysvar};
 
 crate::declare_sysvar_id!("SysvarRent111111111111111111111111111111111", Rent);
 
@@ -16,18 +12,6 @@ pub fn create_account(lamports: u64, rent: &Rent) -> Account {
     rent.create_account(lamports)
 }
 
-pub fn verify_rent_exemption(
-    keyed_account: &KeyedAccount,
-    rent_sysvar_account: &KeyedAccount,
-) -> Result<(), InstructionError> {
-    let rent = Rent::from_keyed_account(rent_sysvar_account)?;
-    if !rent.is_exempt(keyed_account.lamports()?, keyed_account.data_len()?) {
-        Err(InstructionError::InsufficientFunds)
-    } else {
-        Ok(())
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;