Unicorn no-JIT source provenance

Base source:
  unicorn-engine-sys 2.1.5 (Unicorn 2.1.4)
  https://static.crates.io/crates/unicorn-engine-sys/unicorn-engine-sys-2.1.5.crate

No-JIT/Tiny Code Interpreter changes:
  https://github.com/1rhino2/unicorn-tci
  commit 6d0794492de065cdf7e05d7658b4c1b157a34062

The no-JIT build is used on iOS because ordinary Unicorn requires executable
JIT memory that is unavailable to normally signed iOS applications. See the
accompanying Unicorn-COPYING, Unicorn-COPYING.LGPL2, and Unicorn-COPYING_GLIB
files for the applicable license texts.
