Rework OpenMP thread count limit handling

Enable use of AVX512 microkernels with NVIDIA HPC from version 22.3

Use SVE zgemm/cgemm on Arm(R) Neoverse(TM) V1 core

Fix ZHEMM copy for SVE

This patch removes the prefetches from cgemm/zgemm which improves the performance similar to sgemm/dgemm did in #3868, this means I'm happy to enable this on any applicable cores.

I also replicated the unrolling the copies from sgemm and dgemm.

Whilst disambiguating whilelt, I inadvertantly used the wrong datatype
for offsets, which can be negative. This rectifies that.

Add documentation on redistributing OpenBLAS

This touches on the following:

- build configurations
- naming of symbols, shared/static libraries and other build outputs
  like pkg-config and CMake files
- (in more detail) guidance on ILP64 builds

It tries to explain that, while this is only guidance and there may be
reasons to deviate from that, for some build options there are best
practices, and for some others there are choices to make.

It also links to a number of well-maintained build recipes in order
to help packagers of other distros make choices.

Closes gh-3798

[skip ci]

Use latest non-SVE kernels in ARMV8SVE

Add ARMV8SVE to AArch64 Dynamic Dispatch

In order to enable support for future cores which have similar tunings
(in this case I'm doing this for the Arm(R) Neoverse(TM) V2 core), this generically detects SVE support and enables it. This should better manage the size and complexity of dynamic dispatch rather than just copy pasting the same parameters.

To make `ARMV8SVE` more representive of the common 128-bit SVE case,
I've split it and similar parameters from A64FX which has the wider
512-bit SVE.

These are generally better and, in some cases, include threading which helps in the cores we're targeting here.

* Fix actual arguments (Reference-LAPACK PR 885)

Ensure that early calls to blas_set_num_threads will not overwrite unrelated memory

Override the C910V DSDOT with generic code to get rid of the qemu precision error in CI

Fix runtime detection in ARMV8 DYNAMIC_ARCH to check SVE capability

Cirrus CI: Add Apple M1 build using gcc,gmake and OpenMP

Support Alder Lake N (family 6 exmodel 11 model 14) as Haswell

Fix armv8 detection in system_check.cmake

Fix riscv64 detection in system_check.cmake

* Fix workspace query corner cases to always return at least 1

* Fix prototypes for ?GEDMD/?GEDMDQ and their LAPACKE interfaces

Restore zero-initialization of variables in generic ztrsm_utcopy

* Add AppleClang crossbuild to MacOS/arm64 DYNAMIC_ARCH

* add casts to disambiguate svwhilelt for clang

* Fix gcc version checks erroneously excluding clang

* Avoid some mtune names not supported by (Apple)Clang

The cmake scripts incorrectly treated armv8 as 32-bit arm, causing
compilation issues. This just adds 'armv8' to the arm64 condition check.

Add converted C versions of C/ZRSCL to fix build errors introduced by PR4126