BUG: test failure of test_lobpcg with certain BLAS versions/flavours

[h-vetinari]

From conda-forge/scipy-feedstock#210 on linux, using openblas 0.3.21, in addition to #16926, only without skylake**

________________________ test_failure_to_run_iterations ________________________
[gw1] linux -- Python 3.9.13 $PREFIX/bin/python
[...]/scipy/sparse/linalg/_eigen/lobpcg/tests/test_lobpcg.py:267: in test_failure_to_run_iterations
    eigenvalues, _ = lobpcg(A, Q, maxiter=20)
E   Failed: DID NOT WARN. No warnings of type (<class 'UserWarning'>,) were emitted. The list of emitted warnings is: [].
        A          = array([[14.79920401,  3.42395794,  1.11801536, ...,  6.22468706,
        -0.3295225 ,  0.51182501],
       [ 3.4239579...688, -0.74665688],
       [ 0.51182501, -0.35862093, -4.13501843, ...,  0.79367332,
        -0.74665688,  2.67107558]])
        Q          = array([[ 5.55962680e-01,  8.92473887e-01, -4.22314824e-01,
         1.04714029e-01],
       [ 2.28053325e-01,  2.01479...10e-02,
        -9.48932811e-01],
       [ 1.31911756e-01, -1.98056559e+00,  7.68770644e-01,
        -4.21327587e-01]])
        X          = array([[ 1.76405235e+00,  4.00157208e-01,  9.78737984e-01,
         2.24089320e+00,  1.86755799e+00, -9.77277880e-01,
... 2.89120505e-01,  4.12870820e-01,
        -1.98398897e-01,  9.41923003e-02, -1.14761094e+00,
        -3.58114075e-01]])
        _          = array([[-4.27894327e-02, -2.29127117e-01, -1.01234855e-01,
        -1.36639774e-01],
       [-8.89510060e-02, -8.70401...08e-03,
        -1.49249711e-01],
       [ 5.02011307e-02, -3.52297469e-02, -4.87207800e-02,
        -9.35328565e-03]])
        eigenvalues = array([145.57385091, 133.32422064, 123.12573165, 110.50388003])
        rnd        = RandomState(MT19937) at 0x7F53B8BC1E40

**

Test fails for:

Supported SIMD extensions in this NumPy install:
    baseline = SSE,SSE2,SSE3
    found = SSSE3,SSE41,POPCNT,SSE42,AVX,F16C,FMA3,AVX2
    not found = AVX512F,AVX512CD,AVX512_KNL,AVX512_KNM,AVX512_SKX,AVX512_CLX,AVX512_CNL,AVX512_ICL

Test passes for:

Supported SIMD extensions in this NumPy install:
    baseline = SSE,SSE2,SSE3
    found = SSSE3,SSE41,POPCNT,SSE42,AVX,F16C,FMA3,AVX2,AVX512F,AVX512CD,AVX512_SKX
    not found = AVX512_KNL,AVX512_KNM,AVX512_CLX,AVX512_CNL,AVX512_ICL

[h-vetinari]

Also appears with BLIS in conda-forge/scipy-feedstock#223

[h-vetinari]

As of conda-forge/scipy-feedstock#242, this is resolved 🥳