start building the rustdoc book

Author: steveklabnik

src/bootstrap/builder.rs

@@ -266,7 +266,7 @@ impl<'a> Builder<'a> {
             Kind::Bench => describe!(check::Crate, check::CrateLibrustc),
             Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
                 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,
-                doc::Reference),
+                doc::Reference, doc::Rustdoc),
             Kind::Dist => describe!(dist::Docs, dist::Mingw, dist::Rustc, dist::DebuggerScripts,
                 dist::Std, dist::Analysis, dist::Src, dist::PlainSourceTarball, dist::Cargo,
                 dist::Rls, dist::Extended, dist::HashSign),

src/bootstrap/doc.rs

@@ -68,6 +68,7 @@ macro_rules! book {
 book!(
     Nomicon, "src/doc/book", "nomicon";
     Reference, "src/doc/reference", "reference";
+    Rustdoc, "src/doc/rustdoc", "rustdoc";
 );
 
 #[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]