Use 'SPDLOG_FMT_RUNTIME' to fix compilation error throwed MSVC and fmt 9.1.x (#2517)

* Use 'SPDLOG_FMT_RUNTIME' to fix compilation error throwed MSVC and fmt 9.1.x

* Fix #2512

include/spdlog/sinks/daily_file_sink.h

@@ -77,11 +77,14 @@ struct daily_filename_format_calculator
 #else
         // generate fmt datetime format string, e.g. {:%Y-%m-%d}.
         filename_t fmt_filename = fmt::format(SPDLOG_FMT_STRING(SPDLOG_FILENAME_T("{{:{}}}")), filename);
-#    if defined(_MSC_VER) && defined(SPDLOG_WCHAR_FILENAMES) // for some reason msvc doesn't allow fmt::runtime(..) with wchar here
+
+        // MSVC doesn't allow fmt::runtime(..) with wchar, with fmtlib versions < 9.1.x
+#    if defined(_MSC_VER) && defined(SPDLOG_WCHAR_FILENAMES) && FMT_VERSION < 90101
         return fmt::format(fmt_filename, now_tm);
 #    else
         return fmt::format(SPDLOG_FMT_RUNTIME(fmt_filename), now_tm);
 #    endif
+
 #endif
     }