Refs #21325: Do not include fastcdr code in RTD builds

Signed-off-by: eduponz <eduardoponz@eprosima.com>

Author: EduPonz

fastdds_python/src/swig/fastdds.i

@@ -133,8 +133,10 @@ namespace xtypes {
 // Failing to do so will issue a warning, but will not stop the compilation.
 // However, the resulting derived class will **not** be considered as inheriting from the base class
 
+#ifndef FASTDDS_DOCS_BUILD
 %include <fastcdr/config.h>
 %include "fastcdr/xcdr/optional.i"
+#endif
 
 %include "fastdds/LibrarySettings.i"
 %include "fastdds/rtps/common/VendorId_t.i"