rust: allow invalid_runtime_symbol_definitions lint for Rust >= 1.98

Starting with Rust 1.98.0 (expected 2026-08-20), Rust is introducing
a new deny-by-default lint which checks the signature of items whose
symbol name is a runtime symbol expected by `core`:

    error: invalid definition of the runtime `strlen` symbol used by the standard library
         --> rust/uapi/uapi_generated.rs:13998:5
          |
    13998 |     pub fn strlen(s: *const ffi::c_char) -> usize;
          |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
          |
          = note: expected `unsafe extern "C" fn(*const i8) -> usize`
                  found    `unsafe extern "C" fn(*const u8) -> usize`
          = help: either fix the signature or remove any attributes like `#[unsafe(no_mangle)]`, `#[unsafe(export_name = "strlen")]`, or `#[link_name = "strlen"]`
          = note: `#[deny(invalid_runtime_symbol_definitions)]` on by default

    error: invalid definition of the runtime `strlen` symbol used by the standard library
         --> rust/bindings/bindings_generated.rs:19877:5
          |
    19877 |     pub fn strlen(s: *const ffi::c_char) -> usize;
          |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
          |
          = note: expected `unsafe extern "C" fn(*const i8) -> usize`
                  found    `unsafe extern "C" fn(*const u8) -> usize`
          = help: either fix the signature or remove any attributes like `#[unsafe(no_mangle)]`, `#[unsafe(export_name = "strlen")]`, or `#[link_name = "strlen"]`
          = note: `#[deny(invalid_runtime_symbol_definitions)]` on by default

Thus `allow` the lint in `bindings` and `uapi`.

Link: rust-lang/rust#155521 [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

rust/bindings/lib.rs

@@ -22,6 +22,7 @@
 #![feature(cfi_encoding)]
 
 #[allow(dead_code)]
+#[allow(invalid_runtime_symbol_definitions)]
 #[allow(clippy::cast_lossless)]
 #[allow(clippy::ptr_as_ptr)]
 #[allow(clippy::ref_as_ptr)]

rust/uapi/lib.rs

@@ -15,6 +15,7 @@
     clippy::ref_as_ptr,
     clippy::undocumented_unsafe_blocks,
     dead_code,
+    invalid_runtime_symbol_definitions,
     missing_docs,
     non_camel_case_types,
     non_upper_case_globals,