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Guard complex members with a macro owned by ufcx.h (#927)

* Guard complex members with a macro owned by ufcx.h

ufcx.h defined __STDC_NO_COMPLEX__ for MSVC in C++ mode and undefined it
at the end, so the guard in generated code (#917) saw it undefined and
initialised members the struct lacked. Define UFCX_NO_COMPLEX instead and
keep it defined.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JudYk8UecTQyirGsLsHUN2

* Note why clang-cl keeps the complex members

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JudYk8UecTQyirGsLsHUN2

* Treat every MSVC-compatible compiler as lacking complex kernels

Matches DOLFINx, which drops complex kernels for CMake's MSVC including
clang-cl, and FFCx's JIT, which strips them on Windows.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JudYk8UecTQyirGsLsHUN2

* Compile the C++ inclusion test with cffi's compiler

That is MSVC on Windows, so FFCx's Windows CI covers the real case.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JudYk8UecTQyirGsLsHUN2

* Compile the generated-code tests with MSVC on Windows

Set up cl.exe before the unit tests and prefer it in both tests, in
place of distutils.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JudYk8UecTQyirGsLsHUN2

* Report compiler output when a generated-code test fails

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JudYk8UecTQyirGsLsHUN2

* Include C headers before defining restrict in the C++ test

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01JudYk8UecTQyirGsLsHUN2

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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4806 of 5457 relevant lines covered (88.07%)

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