fix: printf mismatch (u8 vs char)

Author: not-matthias

crates/codspeed/build.rs

@@ -16,6 +16,7 @@ fn main() {
     let mut build = cc::Build::new();
     build
         .flag("-std=c11")
+        // .file("instrument-hooks/includes/core.h")
         .file("instrument-hooks/dist/core.c")
         .include("instrument-hooks/includes")
         // We generated the C code from Zig, which contains some warnings
@@ -27,6 +28,7 @@ fn main() {
         .flag("-Wno-type-limits")
         .flag("-Wno-format")
         .flag("-Wno-format-security")
+        .flag("-Wno-builtin-declaration-mismatch")
         // Not supported in clang: https://stackoverflow.com/a/41673702
         .flag_if_supported("-Wno-maybe-uninitialized")
         .warnings(false)