Support compiling libjemalloc5 against musl am: 7326a7c470 am: 727713db35 am: ff4e3653d8

Original change: https://android-review.googlesource.com/c/platform/external/jemalloc_new/+/1776846

Change-Id: I8d68a01b2f70349618ec199681140e2160ddacd6