added G_LOG_DOMAIN macros to several libraries

Define the GLib logging domain in the following libraries: conf,
daemon, event_pipe, log.

src/conf.c

@@ -29,6 +29,9 @@
 #include <stdlib.h>
 #include <errno.h>
 
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "config"
+
 #define MAX_STRING_SIZE	MPD_PATH_MAX+80
 
 #define CONF_COMMENT		'#'

src/daemon.c

@@ -35,6 +35,9 @@
 #include <grp.h>
 #endif
 
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "daemon"
+
 #ifndef WIN32
 
 /** the Unix user name which MPD runs as */

src/event_pipe.c

@@ -34,6 +34,9 @@
 #include <fcntl.h>
 #endif
 
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "event_pipe"
+
 static int event_pipe[2];
 static guint event_pipe_source_id;
 static GMutex *event_pipe_mutex;

src/log.c

@@ -38,6 +38,9 @@
 #include <syslog.h>
 #endif
 
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "log"
+
 #define LOG_LEVEL_SECURE G_LOG_LEVEL_INFO
 
 #define LOG_DATE_BUF_SIZE 16