make: Reapply r928 and r918.

make: Reapply r928 and r918.

shared_library and loadable_module behavior diverge:
- loadable_module only exposes API that is explicitly exposed in the
  outermost gyp target (i.e. sources in the target itself).  (This
  is not a change in behavior.)
- shared_library exposes any API of any library is included in the
  output.  E.g. a shared_library that composes three smaller libraries
  together will have the union of their API.  (This is new.)

Link lines now only contain the gyp depedencies for a given link.
(We used to manually attempt to fix lines that were missing chains
of shared library dependencies.)

Committed: http://code.google.com/p/gyp/source/detail?r=934

[Evan Martin, 2011-06-07 19:58:38]

I again cannot produce any problems with this code locally, so I'm going to use
the trybots to figure it out.