Fix warnings on older GCC, take 2.

format.cc

@@ -117,7 +117,7 @@ const char fmt::internal::DIGITS[] =
     "6061626364656667686970717273747576777879"
     "8081828384858687888990919293949596979899";
     
-FMT_GCC_EXTENSION const uint64_t fmt::internal::POWERS_OF_10[] = {
+const uint64_t fmt::internal::POWERS_OF_10[] = {
   0,
   10,
   100,
@@ -128,16 +128,16 @@ FMT_GCC_EXTENSION const uint64_t fmt::internal::POWERS_OF_10[] = {
   10000000,
   100000000,
   1000000000,
-  10000000000ull,
-  100000000000ull,
-  1000000000000ull,
-  10000000000000ull,
-  100000000000000ull,
-  1000000000000000ull,
-  10000000000000000ull,
-  100000000000000000ull,
-  1000000000000000000ull,
-  10000000000000000000ull
+  ULongLong(1000000000) * 10,
+  ULongLong(1000000000) * 100,
+  ULongLong(1000000000) * 1000,
+  ULongLong(1000000000) * 10000,
+  ULongLong(1000000000) * 100000,
+  ULongLong(1000000000) * 1000000,
+  ULongLong(1000000000) * 10000000,
+  ULongLong(1000000000) * 100000000,
+  ULongLong(1000000000) * 1000000000,
+  ULongLong(1000000000) * 10000000000
 };
 
 void fmt::internal::ReportUnknownType(char code, const char *type) {