Minor CMAKE fixes

This is unlikely to happen in practice, but if it does, the rogue file would get included instead of the dynamically generated version for each target_core, leading to very confusing errors like "invalid operands (undefined UND and ABS sections)" in compilation of the assembly kernels as macros like PREFETCH would remain undefined

Optimize the performance of dot by using universal intrinsics in X86/ARM

Default BLAS3_MEM_ALLOC_THRESHOLD on all platforms to 32

rebase

Avoid out of bounds access on invalid memory free

Lazyly reinit threads after a fork in OMP mode

fix clang std=c18 compilation on aarch64

This initializes the per-thread memory buffers which get
cleared/released on a fork via pthread_at_fork. Not doing so leads to
each thread calling blas_memory_alloc on almost every execution which
slows down the code significantly as the threads race for the memory
allocation using locks to serialize that.

Check for __linux rather than linux in cpuid code and benchmarks

Consolidate usage of backticks for build options

and add a fallback for unsupported operating systems in detect()

rebase

Optimize dcopy/zcopy for POWER10

This patch makes use of new POWER10 vector pair instructions for
loads and stores. Tested in simulator and no new failures.

There were some build options in the README that were not
highlighted. Now all are highlighted.

Optimize the performance of daxpy by using universal intrinsics

FIx underflow/rounding errors in LAPACK (S,D)LANV2

Reference-LAPACK PR 445, fixing their issue 263

Readmefixes

rebase

fix a bug of trmm