Merge "Upgrade mksh to mksh-R59c" am: 6d742e9115

Original change: https://android-review.googlesource.com/c/platform/external/mksh/+/2517224

Change-Id: I27a5c421d637305f2c684fe49d36e8e1e22c62df
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>