Merge "libc: simplify ssse3 detection" into main am: 9cdc2c6b16 am: a3557e5e98

Original change: https://android-review.googlesource.com/c/platform/bionic/+/3262113

Change-Id: I53267f69da0b4de77091af2848ea20fea5049b7e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>