[libc++abi] Add a missing include for abort() (#126865)

This is to fix a build error when we use Clang modules in Chromium.

Author: atetubou

libcxxabi/src/cxa_default_handlers.cpp

@@ -9,6 +9,7 @@
 // new_handler.
 //===----------------------------------------------------------------------===//
 
+#include <cstdlib> // std::abort
 #include <exception>
 #include <new>
 #include "abort_message.h"
@@ -94,7 +95,7 @@ static void demangling_unexpected_handler()
 static constexpr std::terminate_handler default_terminate_handler = demangling_terminate_handler;
 static constexpr std::terminate_handler default_unexpected_handler = demangling_unexpected_handler;
 #else // !LIBCXXABI_SILENT_TERMINATE
-static constexpr std::terminate_handler default_terminate_handler = ::abort;
+static constexpr std::terminate_handler default_terminate_handler = std::abort;
 static constexpr std::terminate_handler default_unexpected_handler = std::terminate;
 #endif // !LIBCXXABI_SILENT_TERMINATE