Prefix static library target filenames with 'lib' to match Xcode. (#831)

* Prefix static library target filenames with 'lib' to match Xcode.

Given a target named 'MyTarget', Xcode automatically prefixes the filename with 'lib', resulting in the filename 'libMyTarget.a'.

* Update CHANGELOG.md

Co-authored-by: Yonas Kolb <yonaskolb@users.noreply.github.com>