fix unexpected tag

[yihau]

(part of #2487)

Problem

warning: unexpected `cfg` condition name: `RUSTC_WITH_SPECIALIZATION`
 --> short-vec/src/lib.rs:2:13
  |
2 | #![cfg_attr(RUSTC_WITH_SPECIALIZATION, feature(min_specialization))]
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: expected names are: `clippy`, `debug_assertions`, `doc`, `docsrs`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `rustfmt`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, and `windows`
  = help: consider using a Cargo feature instead
  = help: or consider adding in `Cargo.toml` the `check-cfg` lint config for the lint:
           [lints.rust]
           unexpected_cfgs = { level = "warn", check-cfg = ['cfg(RUSTC_WITH_SPECIALIZATION)'] }
  = help: or consider adding `println!("cargo::rustc-check-cfg=cfg(RUSTC_WITH_SPECIALIZATION)");` to the top of the `build.rs`
  = note: see <https://doc.rust-lang.org/nightly/rustc/check-cfg/cargo-specifics.html> for more information about checking conditional configuration
  = note: `#[warn(unexpected_cfgs)]` on by default

#2386 (comment)

Summary of Changes

• extract these values as global lints to Cargo.toml and apply them where needed

[workspace.lints.rust.unexpected_cfgs]
level = "warn"
check-cfg = [
    'cfg(target_os, values("solana"))',
    'cfg(feature, values("frozen-abi"))',
    'cfg(RUSTC_WITH_SPECIALIZATION)',
    'cfg(RUSTC_WITHOUT_SPECIALIZATION)',
]

• extract these values as global lints to programs/sbf/Cargo.toml and apply them where needed

[workspace.lints.rust.unexpected_cfgs]
level = "warn"
check-cfg = ['cfg(target_os, values("solana"))']

there are two exceptions that have special config in them:

• perf/Cargo.toml

[lints.rust.unexpected_cfgs]
level = "warn"
check-cfg = [
    'cfg(build_target_feature_avx)',
    'cfg(build_target_feature_avx2)',
    'cfg(RUSTC_WITH_SPECIALIZATION)',
    'cfg(RUSTC_WITHOUT_SPECIALIZATION)',
]

• define-syscall/Cargo.toml

[workspace.lints.rust.unexpected_cfgs]
level = "warn"
check-cfg = ['cfg(target_feature, values("static-syscalls"))']

[yihau]

need to happen in the bump PR itself