Implement loading list of DWARF globals at opening
Implement loading list of DWARF globals at opening

Load the list of Dwarf_Global entries when a library is loaded. This
will allow to lookup information for global functions and variables.
Globals are public ("extern" in C) symbols, which are the ones that
it is interesting to export to the Lua world.

aperezdc/lua-eol,aperezdc/eris,aperezdc/eris,aperezdc/lua-eol