Upgrade libtraceevent to libtraceevent-1.7.1 am: e50996d4ce

Original change: https://android-review.googlesource.com/c/platform/external/libtraceevent/+/2394172

Change-Id: I39665e681e7199acb59ff3b7a3a6dda5190cd4ad
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>