Included sentence on opam config env, and running a test binary.

 Removed unused utility functions and renamed variables

Both samples/sample.c and bindings/haskell/sample/Sample.hs produce the same
output

* ks_free: The 'p' argument should have type unsigned char* to match the type of the 'encoding' argument to ks_asm

handle equal directive. this fixes c-crashes/crash-12-x64-cannot-set-a-variable-that-has-already-been-used.c