chore: release v0.2.16

[github-actions]

🤖 New release

• libm: 0.2.15 -> 0.2.16 (✓ API compatible changes)

Changelog

0.2.16 - 2025-09-22

Other

• Remove usage of the to-be-deprecated core::f32, core::f64 items
• define and implement trait NarrowingDiv for unsigned integer division
• Fix some typos
• Use CARGO_CFG_*_{F16,F128} rather than invoking rustc
• Simplify the configuration for no-panic
• Implement floor and ceil in assembly on i586
• Avoid inlining floor into rem_pio2
• Update for new warn-by-default clippy lints
• Use x86_no_sse configuration in more places
• Enable tests that were skipped on PowerPC
• Allow a new lint failure in nightly
• Test building custom targets and resolve an issue probing rustc
• Use the compiler to determine whether or not to enable f16 and f128
• Improved integer utilities, implement shifts and bug fixes for i256 and u256
• Clean up and sort manifest keys
• Fix incorrect result and add tests
• Fix unintentional skips in binop_common
• Use x.biteq(y) rather than x.to_bits() == y.to_bits()
• Fix new dead_code warnings from recent nightlies
• Reuse libm's Caat and CastFrom in compiler-builtins
• Reuse MinInt and Int from libm in compiler-builtins
• Add a note saying why we use frintx rather than frintn
• Typo in README.md
• Update CmpResult to use a pointer-sized return type
• Clean up unused files
• Fix i256::MAX

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