Removed unneeded macro definition

include/spdlog/common.h

@@ -37,12 +37,9 @@
 
 // backward compatibility with fmt versions older than 8
 #if FMT_VERSION >= 80000
-#    define SPDLOG_FMT_RUNTIME(format_string) fmt::runtime(format_string)
 #    if defined(SPDLOG_WCHAR_FILENAMES) || defined(SPDLOG_WCHAR_TO_UTF8_SUPPORT)
 #        include <spdlog/fmt/xchar.h>
 #    endif
-#else
-#    define SPDLOG_FMT_RUNTIME(format_string) format_string
 #endif
 
 // visual studio upto 2013 does not support noexcept nor constexpr

include/spdlog/sinks/daily_file_sink.h

@@ -53,7 +53,7 @@ struct daily_filename_format_calculator
 #if defined(_MSC_VER) && defined(SPDLOG_WCHAR_FILENAMES) // for some reason msvc doesnt allow fmt::runtime(..) with wchar here
         return fmt::format(fmt_filename, now_tm);
 #else
-        return fmt::format(SPDLOG_FMT_RUNTIME(fmt_filename), now_tm);
+        return fmt::format(fmt_filename, now_tm);
 #endif
     }
 };