Guard the death recipient behavior behind a build flag

The death recipient behavior introduced with Ibb371f4de45530670d5f783f8ead8404c39381b4
is guarded with a build flag
RELEASE_BINDER_DEATH_RECIPIENT_WEAK_FROM_JNI.

Bug: 298374304
Test: build
Change-Id: Ie604ee723385676cf3c83f0d9b2a46ceb322903a
2 files changed