ConfigData: remove unused method DupBlockString()

src/ConfigData.cxx

@@ -25,8 +25,6 @@
 #include "fs/Path.hxx"
 #include "system/FatalError.hxx"
 
-#include <glib.h>
-
 #include <assert.h>
 #include <string.h>
 #include <stdlib.h>
@@ -88,12 +86,6 @@ config_param::GetBlockValue(const char *name, const char *default_value) const
 	return bp->value.c_str();
 }
 
-char *
-config_param::DupBlockString(const char *name, const char *default_value) const
-{
-	return g_strdup(GetBlockValue(name, default_value));
-}
-
 Path
 config_param::GetBlockPath(const char *name, const char *default_value,
 			   Error &error) const

src/ConfigData.hxx

@@ -105,10 +105,6 @@ struct config_param {
 	const char *GetBlockValue(const char *name,
 				  const char *default_value=nullptr) const;
 
-	gcc_malloc
-	char *DupBlockString(const char *name,
-			     const char *default_value=nullptr) const;
-
 	/**
 	 * Same as config_dup_path(), but looks up the setting in the
 	 * specified block.