Merge "Support building libstagefright against musl" am: 5762c46787 am: fa2bdc7112 am: 7cd3ae84ac

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1927575

Change-Id: Ifd77b08750378d6ec1f0145751a7dc5758e646e6