chore: bump nix inputs and implement tikv-jemalloc-sys build fix

[jyap808]

Motivation

This PR fixes building on Nix/NixOS.

Bump inputs to the latest Rust toolchain.

Error:

$ cargo build
error: rustc 1.79.0 is not supported by the following packages:
  [email protected] requires rustc 1.81
  [email protected] requires rustc 1.81
  [email protected] requires rustc 1.81
  [email protected] requires rustc 1.81
  [email protected] requires rustc 1.81
  [email protected] requires rustc 1.81
<SNIP>

tikv-jemalloc-sys fails to build:

  --- stderr
  In file included from /nix/store/6aci60gk5wj4bjj1rygzbkc6ximmsm17-glibc-2.40-66-dev/include/bits/libc-header-start.h:33,
                   from /nix/store/6aci60gk5wj4bjj1rygzbkc6ximmsm17-glibc-2.40-66-dev/include/math.h:27,
                   from include/jemalloc/internal/jemalloc_internal_decls.h:4,
                   from include/jemalloc/internal/jemalloc_preamble.h:5,
                   from src/background_thread.c:1:
  /nix/store/6aci60gk5wj4bjj1rygzbkc6ximmsm17-glibc-2.40-66-dev/include/features.h:422:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
    422 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
        |    ^~~~~~~
  In file included from /nix/store/6aci60gk5wj4bjj1rygzbkc6ximmsm17-glibc-2.40-66-dev/include/bits/libc-header-start.h:33,
                   from /nix/store/6aci60gk5wj4bjj1rygzbkc6ximmsm17-glibc-2.40-66-dev/include/math.h:27,
                   from include/jemalloc/internal/jemalloc_internal_decls.h:4,
                   from include/jemalloc/internal/jemalloc_preamble.h:5,
                   from src/base.c:1:
  /nix/store/6aci60gk5wj4bjj1rygzbkc6ximmsm17-glibc-2.40-66-dev/include/features.h:422:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
<SNIP>

Solution

Bump Nix inputs to upgrade to latest Rust 1.84.1.

Implement CFLAGS workaround NixOS/nixpkgs#370494 (comment) which is an upstream build issue for tikv-jemalloc-sys.

Builds successfully now.

[zerosnacks]

Hi @jyap808

Thanks for your PR 👍

I would like to aggregate the proposed changes into #10485 and, as expressed in #10316 (comment), this will supersede this PR.

Please join the conversation in #10485