Update numpy to use OpenBLAS

[jjerphan]

Summary

Follow-up to #6194. Based on main after Update numpy to run the full test suite #6676 (itself after Add numpy-tests #6610).

This PR only switches the official numpy recipe to OpenBLAS and removes numpy-openblas. The numpy-tests split and np.test(label="full") runner already landed in the PRs above.

The default numpy package now uses OpenBLAS for BLAS and LAPACK (-Dallow-noblas=false), with the flang Fortran ABI patch and the BLAS/LAPACK smokes from #6194. SciPy could be tested against the new builds of OpenBLAS (see #6320).

Template B: Checklist for updating a package

• ⚠️ Bump build number if the version remains unchanged
• Or reset build number to 0 if updating the package to a newer version

PR Formatting

• PR title follows format: Add [package-name] or Update [package-name] to [version]
• PR description includes:
  • Version being added/updated
  • Any special build considerations or patches applied

Package Details

• Package Name: numpy / numpy-tests
• Version: 2.5.3 (build 3)

Build Notes

Same considerations as #6194:

• Host/run dependency on openblas
• Build-local scipy-openblas.pc alias so Meson skips wasm-ld-breaking OpenBLAS symbol probes
• Patch 0002-Match-flang-OpenBLAS-Fortran-ABI-on-Emscripten-wasm32.patch for flang CHARACTER lengths and void subroutine returns
• Patch 0003-Silence-clang-warnings-on-Emscripten-wasm32.patch for emcc/clang 21 diagnostics (32-bit npy_uintp vs INT64_MAX, unused CPU-dispatch helpers, int-max to float rounding). Not OpenBLAS-specific.
• Tests cover show_config BLAS/LAPACK, matmul, Cholesky, solve, and eigh on numpy

Wasm test skips and the numpy-tests suite runner are in #6676. The experimental-channel tag from numpy-openblas is not copied; this targets the main channel.

[jjerphan]

SciPy is not rebuilt in this PR. For now we only want to verify that the NumPy test suite passes (numpy._core and numpy.linalg) on the OpenBLAS-linked build. A later PR can rebuild SciPy against this NumPy (see #6320).

[jjerphan]

numpy-tests is now an additional output of the numpy recipe (same split as scipy-tests in #6334). Runtime stays in numpy; test modules and C helpers go in numpy-tests, which runs np.test().

Standalone packaging PR without the OpenBLAS switch: #6610.

[jjerphan]

Compared np.test(label="full") with the allow-noblas control (#6613). Failures match; they are wasm longdouble / packaging, not OpenBLAS.

	#6613 (allow-noblas, 2.5.2)	this PR (OpenBLAS, 2.5.3)
Ubuntu	7 failed, 47427 passed	3 failed, 47511 passed

The extra four control failures are the print round-trips already skipped here (0002). Shared remaining cases (quantile longdouble 0.4 and typing.tests.test_isfile) are skipped in 0004. Control PR #6613 is closed.

[jjerphan]

Rebased onto #6676 so this PR only applies the OpenBLAS switch:

• numpy-tests packaging → Add numpy-tests #6610
• np.test(label="full") via numpy-tests → Update numpy to run the full test suite #6676
• OpenBLAS-linked numpy and dropping numpy-openblas → this PR

Review the OpenBLAS delta at jjerphan/recipes@numpy-run-full-test-suite...numpy-use-openblas

[jjerphan]

Rebased onto the updated #6676 after that PR was rebased onto main.

[ianthomas23]

Thanks @jjerphan.

In particular thanks for the copious clear documentation making it easy to review.