LUA: remove unused catalog and DTD support

In my opinion, we do not want to encourage use of this.

On the one hand, our libxml2 catalog support has never been thread-safe
and this seems to have caused problems in the past (looking at the
skins2 comments). On the other hand, the xtag plugin never implemented
catalogs, so XML parsers have to handle unknown XML tags gracefully in
any case.

Also, shipping DTDs with VLC is awkward and arguably a waste of space.

modules/misc/lua/libs/xml.c

@@ -45,13 +45,9 @@
  * XML
  *****************************************************************************/
 static int vlclua_xml_create_reader( lua_State * );
-static int vlclua_xml_load_catalog( lua_State * );
-static int vlclua_xml_add_catalog( lua_State * );
 
 static const luaL_Reg vlclua_xml_reg[] = {
     { "create_reader", vlclua_xml_create_reader },
-    { "load_catalog", vlclua_xml_load_catalog },
-    { "add_catalog", vlclua_xml_add_catalog },
     { NULL, NULL }
 };
 
@@ -84,24 +80,6 @@ static int vlclua_xml_create( lua_State *L )
     return 1;
 }
 
-static int vlclua_xml_load_catalog( lua_State *L )
-{
-    xml_t *p_xml = *(xml_t**)luaL_checkudata( L, 1, "xml" );
-    const char *psz_catalog = luaL_checkstring( L, 2 );
-    xml_CatalogLoad( p_xml, psz_catalog );
-    return 0;
-}
-
-static int vlclua_xml_add_catalog( lua_State *L )
-{
-    xml_t *p_xml = *(xml_t**)luaL_checkudata( L, 1, "xml" );
-    const char *psz_str1 = luaL_checkstring( L, 2 );
-    const char *psz_str2 = luaL_checkstring( L, 3 );
-    const char *psz_str3 = luaL_checkstring( L, 4 );
-    xml_CatalogAdd( p_xml, psz_str1, psz_str2, psz_str3 );
-    return 0;
-}
-
 /*****************************************************************************
  * XML Reader
  *****************************************************************************/
@@ -110,7 +88,6 @@ static int vlclua_xml_reader_node_type( lua_State * );
 static int vlclua_xml_reader_name( lua_State * );
 static int vlclua_xml_reader_value( lua_State * );
 static int vlclua_xml_reader_next_attr( lua_State * );
-static int vlclua_xml_reader_use_dtd( lua_State * );
 
 static const luaL_Reg vlclua_xml_reader_reg[] = {
     { "read", vlclua_xml_reader_read },
@@ -118,7 +95,6 @@ static const luaL_Reg vlclua_xml_reader_reg[] = {
     { "name", vlclua_xml_reader_name },
     { "value", vlclua_xml_reader_value },
     { "next_attr", vlclua_xml_reader_next_attr },
-    { "use_dtd", vlclua_xml_reader_use_dtd },
     { NULL, NULL }
 };
 
@@ -190,14 +166,6 @@ static int vlclua_xml_reader_next_attr( lua_State *L )
     return 1;
 }
 
-static int vlclua_xml_reader_use_dtd( lua_State *L )
-{
-    xml_reader_t *p_reader = *(xml_reader_t**)luaL_checkudata( L, 1, "xml_reader" );
-    bool b_value = lua_toboolean( L, 2 );
-    lua_pushinteger( L, xml_ReaderUseDTD( p_reader, b_value ) );
-    return 1;
-}
-
 void luaopen_xml( lua_State *L )
 {
     lua_pushcfunction( L, vlclua_xml_create );