Fails to generate correct code when `UINT64_C` is used

I understand that getting the correct integer type from #define is very difficult, however using UINT64_C should clarify to bindgen that it's a 64-bit integer. Currently the macro parser fails on UINT64_C and the Clang macro fallback is needed, but that still generates a 32-bit integer.

Header:

#include <stdint.h>
#define SOMETHING UINT64_C(1)

Without --clang-macro-fallback:

bindgen --allowlist-item SOMETHING header.h

Output:

/* automatically generated by rust-bindgen 0.71.1 */

With --clang-macro-fallback:

bindgen --clang-macro-fallback --allowlist-item SOMETHING header.h

Output:

/* automatically generated by rust-bindgen 0.71.1 */

pub const SOMETHING: u32 = 1;

Reproduce the issue with the shown header and bindgen commands, then inspect the macro parser and the Clang macro fallback mentioned in the report. The fix is complete when UINT64_C(1) is recognized without fallback and both command variants generate the correct 64-bit Rust constant type.