we always need zlib (even with system libzip as included from zipint.h)
remove remaining exec perm
add libzip License file as this is required by the BSD License term
fixe version macros name
Merge branch 'master' of https://github.com/pierrejoye/php_zip

* 'master' of https://github.com/pierrejoye/php_zip:
  add libzip License file as this is required by the BSD License term
  remove remaining exec perm
  we always need zlib (even with system libzip as included from zipint.h)