?fn(?*anyopaque) callconv(.C) error with zig-imgui causes test failure

[BlueAlmost]

I believe changing file generate.py (and generate.bat) in the function pointer section (line 499 in generate.py) should be changed from:

return '?fn ...

to

return '*const ?fn ...

[jeffbdavenport]

Can we get this changed? Seems right to me as well