Problem:
On macOS Tahoe, `make unittest` started failing with the following error.
````
test/unit/testutil.lua:784: test/unit/testutil.lua:768: (string) '
test/unit/testutil.lua:295: declaration specifier expected near 'ipc_info_object_type_t' at line 2297'
exit code: 256
stack traceback:
test/unit/testutil.lua:784: in function 'itp_parent'
test/unit/testutil.lua:822: in function <test/unit/testutil.lua:812>
````
Solution:
Update filter_complex_blocks.
93526754a9