bump BoringSSL

This is apparently needed to fix a build failure on Windows x86.

Also fixes linking to C++ runtime for BoringSSL
(also see https://boringssl-review.googlesource.com/c/boringssl/+/67147).

Fixes #1761.

quiche/src/build.rs

@@ -170,6 +170,27 @@ fn get_boringssl_cmake_config() -> cmake::Config {
     }
 }
 
+/// Returns the C++ runtime library.
+///
+/// This is required because BoringSSL requires linking to the C++ runtime.
+fn get_cpp_runtime_lib() -> Option<String> {
+    println!("cargo:rerun-if-env-changed=BORINGSSL_RUST_CPPLIB");
+
+    if let Ok(cpp_lib) = std::env::var("BORINGSSL_RUST_CPPLIB") {
+        return Some(cpp_lib);
+    }
+
+    if std::env::var_os("CARGO_CFG_UNIX").is_some() {
+        match std::env::var("CARGO_CFG_TARGET_OS").unwrap().as_ref() {
+            "macos" => Some("c++".into()),
+
+            _ => Some("stdc++".into()),
+        }
+    } else {
+        None
+    }
+}
+
 fn write_pkg_config() {
     use std::io::prelude::*;
 
@@ -248,6 +269,10 @@ fn main() {
             .unwrap_or("static".to_string());
         println!("cargo:rustc-link-lib={bssl_link_kind}=ssl");
         println!("cargo:rustc-link-lib={bssl_link_kind}=crypto");
+
+        if let Some(cpp_lib) = get_cpp_runtime_lib() {
+            println!("cargo:rustc-link-lib={}", cpp_lib);
+        }
     }
 
     if cfg!(feature = "boringssl-boring-crate") {