u-boot: Add patch to use SWIG_AppendOutput

u-boot: Add patch to use SWIG_AppendOutput

Swig has changed language specific AppendOutput functions. The helper
macro SWIG_AppendOutput remains unchanged. Use that instead
of SWIG_Python_AppendOutput, which would require an extra parameter
since swig 4.3.0.

Signed-off-by: Markus Volk <f_l_k@t-online.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>