Auto merge of #73671 - ehuss:update-mdbook, r=Mark-Simulacrum

Update mdbook

This updates mdbook to 0.4.  The list of changes can be found at https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-040.  I think the most important one is the change to include fonts with the book instead of using the Google Fonts CDN. This adds a few megabytes of fonts to the docs component.  It may be possible to share the fonts across the books, but would take a fair bit of work to make that happen, so I'm not sure if it is necessary.

This also removes mdbook-linkcheck. It is currently not being used, and I don't foresee it going back into use anytime soon. I would prefer not to maintain something that isn't being used, and it removes a very large number of dependencies.

1 files changed, 2 insertions, 17 deletions

diff --git a/src/bootstrap/tool.rs b/src/bootstrap/tool.rs
index 0055dee6092..063fb8fbb95 100644
--- a/src/bootstrap/tool.rs
+++ b/src/bootstrap/tool.rs
@@ -12,7 +12,7 @@ use crate::channel;
 use crate::channel::GitInfo;
 use crate::compile;
 use crate::toolstate::ToolState;
-use crate::util::{add_dylib_path, exe, CiEnv};
+use crate::util::{add_dylib_path, exe};
 use crate::Compiler;
 use crate::Mode;
 
@@ -236,7 +236,6 @@ pub fn prepare_tool_cargo(
             || path.ends_with("rls")
             || path.ends_with("clippy")
             || path.ends_with("miri")
-            || path.ends_with("rustbook")
             || path.ends_with("rustfmt")
         {
             cargo.env("LIBZ_SYS_STATIC", "1");
@@ -272,20 +271,6 @@ pub fn prepare_tool_cargo(
     cargo
 }
 
-fn rustbook_features() -> Vec<String> {
-    let mut features = Vec::new();
-
-    // Due to CI budged and risk of spurious failures we want to limit jobs running this check.
-    // At same time local builds should run it regardless of the platform.
-    // `CiEnv::None` means it's local build and `CHECK_LINKS` is defined in x86_64-gnu-tools to
-    // explicitly enable it on single job
-    if CiEnv::current() == CiEnv::None || env::var("CHECK_LINKS").is_ok() {
-        features.push("linkcheck".to_string());
-    }
-
-    features
-}
-
 macro_rules! bootstrap_tool {
     ($(
         $name:ident, $path:expr, $tool_name:expr
@@ -368,7 +353,7 @@ macro_rules! bootstrap_tool {
 }
 
 bootstrap_tool!(
-    Rustbook, "src/tools/rustbook", "rustbook", features = rustbook_features();
+    Rustbook, "src/tools/rustbook", "rustbook";
     UnstableBookGen, "src/tools/unstable-book-gen", "unstable-book-gen";
     Tidy, "src/tools/tidy", "tidy";
     Linkchecker, "src/tools/linkchecker", "linkchecker";