Set the stage for making the builtin modules more dynamic.
Note: this only converts crypto and net, I will add more extensions in a
later commit.
* node.h: Add utility macro for converting macro values to strings.
* node.h: Include the actual module name inside the module structure, not
just the file it was built from.
* node.h: New Macro, NODE_MODULE_DECL, for declaring an external reference
to a module structure.
* node_extensions.cc: New File, implements get_builtin_module, which
iterates over the module structures that are compiled into node.
* node.cc(node::Binding): Use the new module lookup function to find
modules.
* node_{net,crypto}.c: Add NODE_MODULEs to generate the module structure.
Some compile time variables like the cflags and prefix have been moved to
the node_config.h.in, in the anticipation that they will be removed at
somepoint.
This adds the following options to the `configure` program
--shared-v8 Link to a shared V8 DLL instead of static linking
--shared-v8-includes=SHARED_V8_INCLUDES
Directory containing V8 header files
--shared-v8-libpath=SHARED_V8_LIBPATH
A directory to search for the shared V8 DLL
--shared-cares Link to a shared C-Ares DLL instead of static linking
--shared-cares-includes=SHARED_CARES_INCLUDES
Directory containing C-Ares header files
--shared-cares-libpath=SHARED_CARES_LIBPATH
A directory to search for the shared C-Ares DLL
--shared-libev Link to a shared libev DLL instead of static linking
--shared-libev-includes=SHARED_LIBEV_INCLUDES
Directory containing libev header files
--shared-libev-libpath=SHARED_LIBEV_LIBPATH
A directory to search for the shared libev DLL
and removes --system.
