Fix a warning about long long.

format.cc

@@ -519,7 +519,7 @@ void fmt::BasicFormatter<Char>::DoFormat() {
           ++s;
           ++num_open_braces_;
           const Arg &precision_arg = ParseArgIndex(s);
-          unsigned long long value = 0;
+          ULongLong value = 0;
           switch (precision_arg.type) {
           case INT:
             if (precision_arg.int_value < 0)

format.h

@@ -66,6 +66,7 @@
 # pragma warning(push)
 # pragma warning(disable: 4521)
 #endif
+
 namespace fmt {
 
 namespace internal {
@@ -939,6 +940,8 @@ class BasicFormatter {
   int num_open_braces_;
   int next_arg_index_;
 
+  typedef unsigned long long ULongLong;
+
   friend class internal::FormatterProxy<Char>;
 
   // Forbid copying from a temporary as in the following example: