musl: Upgrade to 1.1.19 release point
Changes from the current commit
https://git.musl-libc.org/cgit/musl/log/?qt=range&q=
628cf979b249fa76a80962e2eefe05073216a4db..
55df09bfccbfe21fc9dd7d8f94550c0ff25ace04
Summary of this release
http://www.openwall.com/lists/musl/2018/02/22/2
Author list has been enhanced no changes to license itself
https://git.musl-libc.org/cgit/musl/commit/?id=
1366b3c5e6d89d5ba90dd41fe5bf0246c5299b84
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
