remove extraneous suffix from shared object SONAME

[mattip]

Before, this created a shared object with SONAME libscipy_openblas64_64_.so. Now it is correctly libscipy_openblas64_.so. See MacPython/openblas-libs#151 and numpy/numpy#26258

[mattip]

The OSX_OpenMP_Clang_cmake job ran for more than 60 minutes. Should the timeout be made longer?

[martin-frbg]

weird, I thought I had covered all possible combinations.
regarding Azure, I do not think it is possible to extend the timeout in a "free" account. The behaviour of that job varies depending on which generation of hardware it gets scheduled, I started looking into reducing its dynamic_list but still need to check if one of the tests actually hangs when run on a certain cpu.