Fix CMake unable to detect OpenMP in Windows runner

[kyamagu]

Changes:

• Fix windows build error due to CMake unable to detect OpenMP

[kyamagu]

The windows build error seems a bug in CMake.
https://stackoverflow.com/a/78342596

[kyamagu]

https://gitlab.kitware.com/cmake/cmake/-/issues/20999

[kyamagu]

Neither adding an OpenMP_RUNTIME_MSVC var nor downgrading CMake to 3.29 did not solve the error.
As the last commit succeeded https://github.com/kyamagu/faiss-wheels/actions/runs/11606114456, this error is happening due to some change in the windows runner environment.

[kyamagu]

It looks like the conda dependency changed. The last successful build installed the following conda packages:

      package                    |            build
      ---------------------------|-----------------
      ca-certificates-2024.8.30  |       h56e8100_0         155 KB  conda-forge
      certifi-2024.8.30          |     pyhd8ed1ab_0         160 KB  conda-forge
      libflang-5.0.0             |h6538335_20180525         519 KB  conda-forge
      libopenblas-0.3.28         |pthreads_hf0a32cb_0         3.8 MB  conda-forge
      llvm-meta-5.0.0            |                0           3 KB  conda-forge
      openblas-0.3.28            |pthreads_h[291](https://github.com/kyamagu/faiss-wheels/actions/runs/11606114456/job/32317610963#step:7:292)61c6_0         259 KB  conda-forge
      openmp-5.0.0               |           vc14_1         577 KB  conda-forge
      openssl-3.3.2              |       h2466b09_0         8.0 MB  conda-forge
      ucrt-10.0.22621.0          |       h57928b3_1         547 KB  conda-forge
      vc14_runtime-14.40.33810   |      hcc2c482_22         733 KB  conda-forge
      vs2015_runtime-14.40.33810 |      h3bf8584_22          17 KB  conda-forge
      ------------------------------------------------------------

The failing attempts install the following dependency:

      package                    |            build
      ---------------------------|-----------------
      ca-certificates-2024.8.30  |       h56e8100_0         155 KB  conda-forge
      certifi-2024.8.30          |     pyhd8ed1ab_0         160 KB  conda-forge
      libopenblas-0.3.28         |pthreads_head3c61_1         3.8 MB  conda-forge
      openblas-0.3.28            |pthreads_h4a7f399_1         262 KB  conda-forge
      openssl-3.4.0              |       h2466b09_0         8.1 MB  conda-forge
      ucrt-10.0.22621.0          |       h57928b3_1         547 KB  conda-forge
      vc14_runtime-14.40.33810   |      hcc2c482_22         733 KB  conda-forge
      vs2015_runtime-14.40.33810 |      h3bf8584_22          17 KB  conda-forge
      ------------------------------------------------------------
                                             Total:        13.7 MB

For some reason, libflang and openmp removed from the depenency.