mksh: fix ulimit. am: 55d30846c5 am: 6a00e5063e

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/mksh/+/23169034

Change-Id: I02a306cc6baab1e87adc1cb88d8d9821a6e4a57f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>