* Do not build the tests when only the CBLAS interface is selected

Bug fix and improvements for [z]imatcopy interface.

* Add an M1-based OSX crossbuild and a NeoverseN1 build (plus Windows//LLVM commented out for now)

Mark cblas_xerbla's arguments as const in cblas.h

Fix (redundant) lapack-runtest target in toplevel Makefile

Add suggestions to NUM_THREADS/auxiliary buffer message

Do not requires GNU mktemp

fix cblas_?gemmt

Historically the GNU mktemp was the first one which doesn't requires
`-t` to create a directory.

Here I've introduced a fallback when `-t` is required.

For example MacPorts contains similar patch: bbe8abfe26/math/OpenBLAS/files/patch-MacOSX-mktemp.diff

[WIP] Disable gcc's tree-vectorizer for x86_64 CGEMV

Use SVE kernel for SGEMM/DGEMM on Arm(R) Neoverse(TM) V1

Adapt CI rules for MSYS2 for updated ccache

Generally disable gcc's tree-vectorizer in x86_64 SGEMV,SSYMV,ZGEMV,C/ZDOT

Propagate SWITCH_RATIO to DYNAMIC_ARCH builds

SWITCH_RATIO for Arm(R) Neoverse(TM) architecture

Fix instabilities in CGEMM/CTRMM/DNRM2 on Apple M1/M2 under OSX

Remove any stray trailing dash from CROSS_SUFFIX

This re-spins #3869 with some additional copy unrolling which helps maintain SYRK performance.

After #3868, the SVE kernels represent a pretty good boost.

This re-uses ARMV8SVE as a base and I'm going to incrementally move everything to use ARMV8SVE in additional patches (as well as fix up anything that's not already in ARMV8SVE).

This seems like a good balance of values for reasonably sized matrices. With `SWITCH_RATIO=16` the DGEMM scales better to bigger sizes but the better solution would be some kind of
thread throttling so I've gone with `SWITCH_RATIO=8`.

Previously dynamic builds were either using the default SWITCH_RATIO
or one from the higher level architecture; this patch ensures the
dynamic builds can use this parameter as well.

Add Chris Sidebottom to CONTRIBUTORS.md

parallel build fixes

Fix ?GEMMT implementation

fix missing blank in c_check