rustbuild: Start building --enable-extended

This commit adds a new flag to the configure script,
`--enable-extended`, which is intended for specifying a desire to
compile the full suite of Rust tools such as Cargo, the RLS, etc. This
is also an indication that the build system should create combined
installers such as the pkg/exe/msi artifacts.

Currently the `--enable-extended` flag just indicates that combined
installers should be built, and Cargo is itself not compiled just yet
but rather only downloaded from its location. The intention here is to
quickly get to feature parity with the current release process and then
we can start improving it afterwards.

All new files in this PR inside `src/etc/installer` are copied from the
rust-packaging repository.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/bootstrap/config.toml.example b/src/bootstrap/config.toml.example
index 47e50cb79b4..4b859482562 100644
--- a/src/bootstrap/config.toml.example
+++ b/src/bootstrap/config.toml.example
@@ -118,6 +118,12 @@
 # option to true.
 #full-bootstrap = false
 
+# Enable a build of the and extended rust tool set which is not only the
+# compiler but also tools such as Cargo. This will also produce "combined
+# installers" which are used to install Rust and Cargo together. This is
+# disabled by default.
+#extended = false
+
 # =============================================================================
 # General install configuration options
 # =============================================================================