Revert "user: Add --release option to Rust instructions"
Summary
Revert "user: Add --release option to Rust instructions"
The bug in the Rust compiler_builtin has been fixed with https://github.com/rust-lang/rust/commit/7d53688b25d52d822c7094ee80db42b2b2f2a8d3
The workaround for issue #32 (closed) is not longer required.
This reverts commit 0b2d95d5.
Edited by Amar Takhar