try to fix sanitizers; first step

Author: Eclips4

Modules/cpython-sys/build.rs

@@ -63,6 +63,10 @@ fn generate_c_api_bindings(srcdir: &Path, builddir: Option<&str>, out_path: &Pat
     // Suppress all clang warnings (deprecation warnings, etc.)
     builder = builder.clang_arg("-w");
 
+    // Use C11 with GNU extensions so that <stdatomic.h> is available,
+    // required by the mimalloc headers.
+    builder = builder.clang_arg("-std=gnu11");
+
     // Tell clang the correct target triple for cross-compilation when we have
     // an LLVM-specific triple. Otherwise let bindgen translate Cargo's TARGET
     // itself (e.g. aarch64-apple-ios-sim -> arm64-apple-ios-simulator).