MUST get rid of this calledByIOWatcher stuff. Hopefully will be able to when
securepair stuff lands.

Does the same timeout action for maxConnections as it does for EMFILE.

All net servers now share the same dummy socket. The ulimit warning is
throttled for all servers.

- utilizing autoconf configure.guess to output canonical $target_{cpu,vendor,os}
- normalizing $target_cpu --> $arch according to v8 naming scheme
- normalizing $target_os --> $platform according to v8 naming scheme
- renamed c-ares platform-arch directories to represent v8 canonical names
- new targets in Makefile: libnode-{static,dynamic}[-debug]
- scons is symbolized as SCONS in Makefile for portability/flexibility.
- LINKFLAGS inherith from LDFLAGS ("magic" variable exported by autoconf and configure).
- When building on OS X, CFLAGS and LDFLAGS will contain appropriate -arch flag, set up by configure (instead of the Makefile).
- libv8.a make targets cleaned up with unison libv8_flags set of flags.
- the clean make target now cleans up libraries (libv8, libnode, etc).
- added config.guess, config.sub and install-sh (utilized by autoconf/configure)

Rather than aborting in the face of *any* repeated link in a given path,
instead only abort if such a cycle actually makes a given path unresolvable.

Test for this by doing a normal stat.  Still use the seenLinks object to
cache link contents so as to cut own a little bit on readlink calls.

Also add a pathological test that fails without the change to fs.js.

Implementing a tip from Marc Lehmann:
http://pod.tst.eu/http://cvs.schmorp.de/libev/ev.pod#The_special_problem_of_accept_ing_wh

Keep an extra FD around for every server. When you hit EMFILE, destroy that
FD, accept a connection, close it; in this way you can clear the connection
queue and let people know that you're overload.

No more timeout needed.