Currently servo failed to upgrade to jemalloc 5.0.1 due to a build failure on android.

The log is here (read from end): http://build.servo.org/builders/android/builds/11294/steps/compile/logs/stdio

jemalloc/src/background_thread.c:83:2: error: unknown type name 'cpu_set_t'
cpu_set_t cpuset;
^

Are there any peculiarities that must be taken into account to compile jemalloc 5.x on Android? Maybe the Android version we are targeting is too old and not supported by jemallocator anymore ?

Rust is also stuck on jemalloc 4.5 due to some unstable behavior with jemalloc 5 on Android (segfaults): rust-lang/rust#45163 (comment)

Maybe we are just building jemalloc on Android incorrectly ?