bio: remove BIO_CTRL_PUSH/_POP.

We don't support the SSL BIO so this is a no-op change.

Change-Id: Iba9522b837ebb0eb6adc80d5df6dcac99abf2552
Reviewed-on: https://boringssl-review.googlesource.com/4360
Reviewed-by: Adam Langley <agl@google.com>
2 files changed