quiche_buffer_allocator.h -- include cstring for memcpy

PiperOrigin-RevId: 864415921

quiche/common/quiche_buffer_allocator.h

diff --git a/quiche/common/quiche_buffer_allocator.h b/quiche/common/quiche_buffer_allocator.h
index 4fb1bd4..bc556ce 100644
--- a/quiche/common/quiche_buffer_allocator.h
+++ b/quiche/common/quiche_buffer_allocator.h
@@ -7,6 +7,7 @@
 
 #include <stddef.h>
 
+#include <cstring>
 #include <memory>
 
 #include "absl/strings/string_view.h"