Bug#713072: Updated to upstream version 0.9.11

[Kevin Bortis]

Repository: https://github.com/wermut/musl

Release tag: https://github.com/wermut/musl/tree/debian/0.9.11-1

Works with musl-0.9.11:
http://www.musl-libc.org/releases/musl-0.9.11.tar.gz