the SONAME in the linux shared object is wrong

[mattip]

After #141 and removing the local patch, the wheel seems to be produced correctly but the SONAME in the shared object (on linux at least) is wrong: libscipy_scipy_openblas.so.

[mattip]

Also, OpenMathLib/OpenBLAS#4534 will require fixes on windows for the latest nightly build: now both SYMBOLPREFIX and LIBNAMEPREFIX (and correspondingly SUFFIX) should be defined.