build: remove unused Carbon dependency

Libuv as of joyent/libuv@d48168a no longer has link-time dependencies
on the Carbon framework or any other frameworks.
uv: upgrade to v0.11.13

This commit changes src/tcp_wrap.cc and src/udp_wrap.cc just enough to
get by (i.e. to compile and function correctly.)

The new libuv API allows for more cleanup and deduplication but I'm
saving that for another day.