[python] Test: disable incremental linking for Windows AOT runtime test modules

[alexreinking]

Summary

This is a test, not a confirmed fix. Opening as draft to see whether it actually resolves the flake before merging.

Our Windows CI buildbots have been intermittently failing python_bindings/halide-runtime/test/CMakeLists.txt's runtimeadd.dll link with:

runtimeadd_aot.lib(runtimeadd_aot.obj) : fatal error LNK1236: corrupt or invalid COFF sections

This always occurs on the last target reconfigure in the CI matrix (x86-64-windows → x86-64-windows-sse41), always on the runtimeadd module specifically (never callconv/callconv_xor, which are built the same way), and so far only on one of our two Windows workers. The CI recipe reconfigures and rebuilds the same build tree in place for ~9 different Halide_TARGETs, so this module gets relinked with /INCREMENTAL against a changed /WHOLEARCHIVE static library many times per job — a pattern with a documented history of tripping MSVC's incremental linker.

This PR disables incremental linking for these MSVC module targets. They're one-shot build artifacts (loaded by a Python test, never iterated on interactively), so incremental linking buys nothing.

Since this flake is intermittent and worker-specific, we don't yet know if this is the actual root cause or just a plausible contributor — keeping this as a draft until we've seen enough CI runs to tell.

Test plan

• Watch several CI runs on the Windows builders and confirm LNK1236 no longer occurs on the previously-affected worker.
• If it recurs, investigate other causes (e.g. environment differences between the two Windows workers) before merging.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.17%. Comparing base (866fe46) to head (f4db9ea).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9415      +/-   ##
==========================================
+ Coverage   70.00%   70.17%   +0.16%     
==========================================
  Files         261      261              
  Lines       79402    79402              
  Branches    19360    19360              
==========================================
+ Hits        55586    55719     +133     
+ Misses      17941    17889      -52     
+ Partials     5875     5794      -81     

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