declare_program! panics when program has a shared Accounts context

[tomjohn1028]

Description

The declare_program! macro is panicking with the error below when used with a program that uses shared contexts across multiple instructions.

error[E0428]: the name `__cpi_client_accounts_shared_accounts` is defined multiple times
 --> lib/my-crate/src/lib.rs:3:1
  |
3 | declare_program!(external_program);
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ `__cpi_client_accounts_shared_accounts` redefined here
  |
  = note: `__cpi_client_accounts_shared_accounts` must be defined only once in the type namespace of this module
  = note: this error originates in the macro `declare_program` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0428]: the name `__client_accounts_shared_accounts` is defined multiple times
 --> lib/my-crate/src/lib.rs:3:1
  |
3 | declare_program!(external_program);
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^ `__client_accounts_shared_accounts` redefined here
  |
  = note: `__client_accounts_shared_accounts` must be defined only once in the type namespace of this module
  = note: this error originates in the macro `declare_program` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0428`.
error: could not compile `my-crate` (lib) due to 2 previous errors

Steps to Reproduce

1. Checkout branch on this fork https://github.com/exo-tech-xyz/anchor/tree/declare-program-client-redefined
2. cd /tests/declare-program
3. cargo build

[tomjohn1028]

Came back to this and realized it only happens when running cargo build, so worth noting I'm attempting to use declare_program! in an off-chain program.

On this branch I was able to reproduce the error and edited the above to include the steps.