Updated OSX executables and added 'fake' proxy for lua-dist support (ref #225).

LuaDist relies on using liblua.dylib for all its modules with the same
name for both Lua 5.1 and Lua 5.2 interpreters. This presents an issue for
ZBS as it needs not only to refer to a proper liblua.dylib, but also to
avoid loading two interpreters as its own interperter loads its own
library.

To resolve this, liblua.dylib doesn't export any symbols (it's a dummy
library), but it needs to be present to satisfy dyld dependency (as some
of the libraries and LuaDist build process are outside of our control).

All the other Lua symbols are already available in memory, but to make
LuaDist libraries to use them, we enforce flat namespace.