Fix "discards ‘const’ qualifier" warnings

src/core/modules.c

@@ -289,7 +289,7 @@ void modules_deinit(void)
 
 	while (list != NULL) {
 		module_uniq_destroy(list->data);
-		gconstpointer tmp = list->data;
+		void *tmp = list->data;
 		list = g_slist_remove(list, list->data);
 		g_free(tmp);
 	}

src/core/rawlog.c

@@ -64,7 +64,7 @@ static void rawlog_add(RAWLOG_REC *rawlog, char *str)
 	if (rawlog->nlines < rawlog_lines || rawlog_lines <= 2)
 		rawlog->nlines++;
 	else {
-		gconstpointer tmp = rawlog->lines->data;
+		void *tmp = rawlog->lines->data;
 		rawlog->lines = g_slist_remove(rawlog->lines,
 					       rawlog->lines->data);
 		g_free(tmp);

src/fe-common/core/themes.c

@@ -1424,7 +1424,7 @@ void themes_reload(void)
 	change_theme(settings_get_str("theme"), FALSE);
 
 	while (refs != NULL) {
-		gconstpointer tmp = refs->data;
+		void *tmp = refs->data;
 		refs = g_slist_remove(refs, refs->data);
 		theme_unref(tmp);
 	}