1.11.0rc1: remaining test failures in conda-forge

[h-vetinari]

After fixes for #18600 & #18601, the following test failures remain in conda-forge/scipy-feedstock#235:

On linux-ppc64le:

=================================== FAILURES ===================================
_____ TestHyp1f1.test_a_negative_integer[-150-1-1.5--0.17336479551542044] ______
[gw0] linux -- Python 3.11.3 $PREFIX/bin/python
../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_plac/lib/python3.11/site-packages/scipy/special/tests/test_hypergeometric.py:78: in test_a_negative_integer
    assert_allclose(sc.hyp1f1(a, b, x), result, atol=0, rtol=1e-14)
        a          = -150
        b          = 1
        result     = -0.17336479551542044
        self       = <scipy.special.tests.test_hypergeometric.TestHyp1f1 object at 0x4043766710>
        x          = 1.5
../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_plac/lib/python3.11/contextlib.py:81: in inner
    return func(*args, **kwds)
E   AssertionError: 
E   Not equal to tolerance rtol=1e-14, atol=0
E   
E   Mismatched elements: 1 / 1 (100%)
E   Max absolute difference: 2.24820162e-15
E   Max relative difference: 1.29680401e-14
E    x: array(-0.173365)
E    y: array(-0.173365)
        args       = (<function assert_allclose.<locals>.compare at 0x42d6f83600>, array(-0.1733648), array(-0.1733648))
        func       = <function assert_array_compare at 0x402211c360>
        kwds       = {'equal_nan': True, 'err_msg': '', 'header': 'Not equal to tolerance rtol=1e-14, atol=0', 'verbose': True}
        self       = <contextlib._GeneratorContextManager object at 0x4021ed0cd0>

On windows + pypy (CC @mattip):

================================== FAILURES ===================================
____________________ TestShgoArguments.test_10_finite_time ____________________
[gw0] win32 -- Python 3.9.16 %PREFIX%\python.exe
..\_test_env\lib\site-packages\scipy\optimize\tests\test__shgo.py:703: in test_10_finite_time
    assert res.nit == 1
E   assert 4 == 1
E    +  where 4 =  message: Failed to find a feasible minimizer point. Lowest sampling point = 0.0\n success: False\n     fun: 0.0\n       x: [-1.000e+00 -1.000e+00]\n     nit: 4\n    nfev: 20\n   nlfev: 0\n   nljev: 0\n   nlhev: 0\n    tnev: 20.nit
        f          = <function TestShgoArguments.test_10_finite_time.<locals>.f at 0x000002cbbde24ac0>
        options    = {'maxtime': 1e-15}
        res        =  message: Failed to find a feasible minimizer point. Lowest sampling point = 0.0
 success: False
     fun: 0.0
       x: [-1.000e+00 -1.000e+00]
     nit: 4
    nfev: 20
   nlfev: 0
   nljev: 0
   nlhev: 0
    tnev: 20
        self       = <scipy.optimize.tests.test__shgo.TestShgoArguments object at 0x000002cb9cf3f328>

[mattip]

windows + pypy is probably not going to get a fix any time soon. If you want a clean test suite, I would suggest you skip the failure.