Only the latest MSVC allows designated initalisers.

Change-Id: I34892b79ba45dbc7a7fe604da8cf6d62d87f6485
Reviewed-on: https://code-review.googlesource.com/c/re2/+/51973
Reviewed-by: Paul Wankadia <junyer@google.com>
diff --git a/re2/dfa.cc b/re2/dfa.cc
index fa4686f..a269870 100644
--- a/re2/dfa.cc
+++ b/re2/dfa.cc
@@ -1186,8 +1186,8 @@
   cache_lock->LockForWriting();
 
   hooks::GetDFAStateCacheResetHook()({
-      .state_budget = state_budget_,
-      .state_cache_size = state_cache_.size(),
+      state_budget_,
+      state_cache_.size(),
   });
 
   // Clear the cache, reset the memory budget.
@@ -1925,7 +1925,7 @@
                              failed, &ep, matches);
   if (*failed) {
     hooks::GetDFASearchFailureHook()({
-      // Nothing yet...
+        // Nothing yet...
     });
     return false;
   }