extract rustc-std-workspace crate sources from crates.io and place them here

src/rustc-std-workspace/README.md

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+See `library/rustc-std-workspace-core/README.md` for context.
+
+These are the crates.io versions of these crates, as opposed to the versions
+in `library` which are the ones used inside the rustc workspace.

src/rustc-std-workspace/rustc-std-workspace-alloc/Cargo.toml

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+[package]
+name = "rustc-std-workspace-alloc"
+version = "1.0.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+edition = "2018"
+license = 'MIT/Apache-2.0'
+description = 'workspace hack'
+
+[dependencies]

src/rustc-std-workspace/rustc-std-workspace-core/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "rustc-std-workspace-core"
+version = "1.0.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+license = "MIT/Apache-2.0"
+description = """
+Explicitly empty crate for rust-lang/rust integration
+"""
+
+[dependencies]

src/rustc-std-workspace/rustc-std-workspace-std/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "rustc-std-workspace-std"
+version = "1.0.1"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+license = "MIT/Apache-2.0"
+description = "Workaround for rustbuild"
+
+[lib]
+name = "std"
+

src/rustc-std-workspace/rustc-std-workspace-std/src/lib.rs

@@ -0,0 +1 @@
+pub use std::*;