mksh: fix ulimit. am: 55d30846c5

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

Change-Id: Icb1290528ef516993e7c025c9f3187b646b0b72e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>