gnu: rust: Bootstrap with rust-1.54.0.

* gnu/packages/rust.scm (rust-1.39): Rename to rust-bootstrap. Update to
1.54.0.
[source]: Update snippet to new version. Replace mrustc patch for 1.39.0
with patch for 1.54.0.
[inputs]: Remove libssh2. Replace llvm-9 with llvm. Add gcc-9.
[arguments]: Adjust custom 'setup-mrustc-sources to also create file
with rust version. Adjust custom 'patch-makefiles phase to changes in
mrustc's build steps. Adjust custom 'build phase to follow mrustc's
build steps for rust-1.54.
(rust-1.40): Replace post-bootstrapped rust-1.40 with 1.55.
[arguments]: Add custom 'set-linker-locale-to-utf8 phase. Adjust custom
'build phase. Remove custom 'neuter-tidy phase.
[inputs]: Replace llvm-9 with llvm.
(rust-1.41, rust-1.42, rust-1.43, rust-1.44, rust-1.45, rust-1.46,
rust-1.47, rust-1.48, rust-1.49, rust-1.50, rust-1.51, rust-1.52,
rust-1.53): Remove variables.

* gnu/packages/patches/rust-1.39.0-src.patch: Remove file.
* gnu/packages/patches/rust-1.54.0-src.patch: Add file.
* gnu/local.mk (dist_patch_DATA): Register changes.

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