Fix ambiguous ifdefs in tests for user-defined options in Makefiles

rebase

allow setting soname without suffix or prefix

Improve the performance of dasum and sasum when SMP is defined

Add reproducer test for crash after fork

Don't overwrite blas_thread_buffer if already set

See #2993 for an analysis

After a fork it is possible that blas_thread_buffer has already
allocated memory buffers: goto_set_num_threads does allocate those
already and it may be called by num_cpu_avail in case the OpenBLAS
NUM_THREADS differ from the OMP num threads.
This leads to a memory leak which can cause subsequent execution of BLAS
kernels to fail.

Fixes #2993

Fix sum optimize issues

Optimize the performance of rot by using universal intrinsics

Fix missing -mfma compiler flag in cmake builds without DYNAMIC_ARCH

rebase

Merge branch 'openblas-open-910' of git://github.com/damonyu1989/OpenBLAS into damonyu1989-openblas-open-910

Improve the performance of rot by using AVX512 and AVX2 intrinsic

Fix missing AVX2 and FMA3 capabilities in FORCE_target mode

Optimize sdot/ddot for POWER10

Fix handling of cpu capability flags in DYNAMIC_ARCH builds

This patch makes use of new POWER10 vector pair instructions for
loads and stores.

rebase