FMT_MSC_VER -> FMT_MSC_VERSION

test/xchar-test.cc

@@ -66,7 +66,7 @@ TYPED_TEST(is_string_test, is_string) {
 }
 
 // std::is_constructible is broken in MSVC until version 2015.
-#if !FMT_MSC_VER || FMT_MSC_VER >= 1900
+#if !FMT_MSC_VERSION || FMT_MSC_VERSION >= 1900
 struct explicitly_convertible_to_wstring_view {
   explicit operator fmt::wstring_view() const { return L"foo"; }
 };