mksh: fix ulimit. am: 55d30846c5 am: e99a70b190 am: 4dd862cffa

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

Change-Id: I84c1afe16d1ee60c99f487736d2e9ab3fd66bf62
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>