Bug#951886: mapserver FTBFS with swig 4.0.1

[Adrian Bunk]

Source: mapserver
Version: 7.4.3-1
Severity: serious
Tags: ftbfs

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/mapserver.html

...
/build/1st/mapserver-7.4.3/obj-x86_64-linux-gnu/mapscript/python/CMakeFiles/_pythonmapscript.dir/mapscriptPYTHON_wrap.c:
 In function '_wrap_CompositingFilter_filter_set':
/build/1st/mapserver-7.4.3/obj-x86_64-linux-gnu/mapscript/python/CMakeFiles/_pythonmapscript.dir/mapscriptPYTHON_wrap.c:6617:66:
 error: expected expression before ',' token
 6617 |   if (!PyArg_ParseTuple(args, "Oz:CompositingFilter_filter_set", , 
&arg2)) SWIG_fail;
      |                                                                  ^
...