Move extra::flate to libflate

This is hopefully the beginning of the long-awaited dissolution of libextra.
Using the newly created build infrastructure for building libraries, I decided
to move the first module out of libextra.

While not being a particularly meaty module in and of itself, the flate module
is required by rustc and additionally has a native C dependency. I was able to
very easily split out the C dependency from rustrt, update librustc, and
magically everything gets installed to the right locations and built
automatically.

This is meant to be a proof-of-concept commit to how easy it is to remove
modules from libextra now. I didn't put any effort into modernizing the
interface of libflate or updating it other than to remove the one glob import it
had.

src/librustdoc/html/markdown.rs

@@ -16,7 +16,9 @@
 //! functionality through a unit-struct, `Markdown`, which has an implementation
 //! of `fmt::Default`. Example usage:
 //!
-//! ```rust
+//! ```rust,ignore
+//! use rustdoc::html::markdown::Markdown;
+//!
 //! let s = "My *markdown* _text_";
 //! let html = format!("{}", Markdown(s));
 //! // ... something using html