logging cleanups

* Moved all logging-related stuff into log.c
(and not myfprintf.c)

* ISO C90-compliant strftime usage:
%e and %R replaced with %d and %H:%M respectively

* Got rid of variadic macros since some old-school compilers
don't like them

* compiling with -DNDEBUG disables the DEBUG() macro

git-svn-id: https://svn.musicpd.org/mpd/trunk@4512 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/sig_handlers.c

@@ -79,7 +79,7 @@ int handlePendingSignals()
 			readDirectoryDB();
 			playlistVersionChange();
 		}
-		if (myfprintfCloseAndOpenLogFile() < 0)
+		if (cycle_log_files() < 0)
 			return COMMAND_RETURN_KILL;
 		playerCycleLogFiles();
 	}