Rewrite in6_addr::__in6_u::__u8_addr8 as libc::in6_addr::s6_addr (Cpp2Rust#177)

Author: lucic71

cpp2rust/converter/converter.cpp

@@ -2689,6 +2689,7 @@ replaceNonUniformLibcField(clang::MemberExpr *expr) {
   static constexpr Mapping kFields[] = {
       {"stat", "st_mtim", "tv_sec", "st_mtime"},      // Linux
       {"stat", "st_mtimespec", "tv_sec", "st_mtime"}, // macOS
+      {"in6_addr", "__in6_u", "__u6_addr8", "s6_addr"},
   };
 
   auto getNamedIdentifierOrNull = [](auto *decl) {