continuous integration is failing with a rust link error

[ctb]

perhaps because of:

• Project unmaintained actions-rs/toolchain#216

   Compiling version_check v0.9.4
error: linking with `cc` failed: exit status: 1
Error:   |
  = note: LC_ALL="C" PATH="/home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/runner/miniconda3/envs/sourmash_dev/bin:/home/runner/miniconda3/condabin:/home/runner/miniconda3/condabin:/snap/bin:/home/runner/.local/bin:/opt/pipx_bin:/home/runner/.cargo/bin:/home/runner/.config/composer/vendor/bin:/usr/local/.ghcup/bin:/home/runner/.dotnet/tools:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/runner/.dotnet/tools" VSLANG="1033" "cc" "-m64" "/tmp/rustccROwP9/symbols.o" "/home/runner/work/sourmash_plugin_branchwater/sourmash_plugin_branchwater/target/debug/build/proc-macro2-20477fad7ec36b78/build_script_build-20477fad7ec36b78.build_script_build.57280afd960ffe10-cgu.0.rcgu.o" "/home/runner/work/sourmash_plugin_branchwater/sourmash_plugin_branchwater/target/debug/build/proc-macro2-20477fad7ec36b78/build_script_build-20477fad7ec36b78.td1vtd4nd39p80k.rcgu.o" "-Wl,--as-needed" "-L" "/home/runner/work/so
  = note: /home/runner/miniconda3/envs/sourmash_dev/bin/../lib/gcc/x86_64-conda-linux-gnu/10.4.0/../../../../x86_64-conda-linux-gnu/bin/ld: /home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-d2ef02247056996e.rlib(std-d2ef02247056996e.std.e4dfbc2c3f4b09f1-cgu.0.rcgu.o): in function `std::sys::pal::unix::stack_overflow::imp::sigstack_size':
          /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys/pal/unix/stack_overflow.rs:216: undefined reference to `getauxval'
          /home/runner/miniconda3/envs/sourmash_dev/bin/../lib/gcc/x86_64-conda-linux-gnu/10.4.0/../../../../x86_64-conda-linux-gnu/bin/ld: /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys/pal/unix/stack_overflow.rs:216: undefined reference to `getauxval'
          collect2: error: ld returned 1 exit status
          
  = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
  = note: use the `-l` flag to specify native libraries to link
  = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#rustc-link-lib)
error: aborting due to 1 previous error
Error: aborting due to 1 previous error
error: could not compile `proc-macro2` (build script) due to 2 previous errors
Error: warning: build failed, waiting for other jobs to finish...
error: linking with `cc` failed: exit status: 1
Error:   |
  = note: LC_ALL="C" PATH="/home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/home/runner/miniconda3/envs/sourmash_dev/bin:/home/runner/miniconda3/condabin:/home/runner/miniconda3/condabin:/snap/bin:/home/runner/.local/bin:/opt/pipx_bin:/home/runner/.cargo/bin:/home/runner/.config/composer/vendor/bin:/usr/local/.ghcup/bin:/home/runner/.dotnet/tools:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/home/runner/.dotnet/tools" VSLANG="1033" "cc" "-m64" "/tmp/rustc3CraUh/symbols.o" "/home/runner/work/sourmash_plugin_branchwater/sourmash_plugin_branchwater/target/debug/build/libc-a96a008452bf9bd6/build_script_build-a96a008452bf9bd6.build_script_build.e8206320e0b73efc-cgu.0.rcgu.o" "/home/runner/work/sourmash_plugin_branchwater/sourmash_plugin_branchwater/target/debug/build/libc-a96a008452bf9bd6/build_script_build-a96a008452bf9bd6.build_script_build.e8206320e0b73efc-cgu.1.rcgu.o" "/home/runner/work/sourmash_plug
error: could not compile `libc` (build script) due to 2 previous errors
  = note: /home/runner/miniconda3/envs/sourmash_dev/bin/../lib/gcc/x86_64-conda-linux-gnu/10.4.0/../../../../x86_64-conda-linux-gnu/bin/ld: /home/runner/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-d2ef02247056996e.rlib(std-d2ef02247056996e.std.e4dfbc2c3f4b09f1-cgu.0.rcgu.o): in function `std::sys::pal::unix::stack_overflow::imp::sigstack_size':
          /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys/pal/unix/stack_overflow.rs:216: undefined reference to `getauxval'
          /home/runner/miniconda3/envs/sourmash_dev/bin/../lib/gcc/x86_64-conda-linux-gnu/10.4.0/../../../../x86_64-conda-linux-gnu/bin/ld: /rustc/9b00956e56009bab2aa15d7bff10916599e3d6d6/library/std/src/sys/pal/unix/stack_overflow.rs:216: undefined reference to `getauxval'
          collect2: error: ld returned 1 exit status
          
  = note: some `extern` functions couldn't be found; some native libraries may need to be installed or have their path specified
  = note: use the `-l` flag to specify native libraries to link
  = note: use the `cargo:rustc-link-lib` directive to specify the native libraries to link with Cargo (see https://doc.rust-lang.org/cargo/reference/build-scripts.html#rustc-link-lib)
error: aborting due to 1 previous error
Error: aborting due to 1 previous error
error: linking with `cc` failed: exit status: 1