Update brief function descriptions in ?GEGS/?GEGV (Reference-LAPACK PR 831)

* Add comment related to zero-sized matrix B

Fix scaling in LAPACK STGSNA/DTGSNA (Reference-LAPACK PR 830)

Fix segfault on running lapacke_?geqrt with row major data (Reference-LAPACK PR 768)

Add LAPACKE interfaces for [CZ]UNHR_COL and [SD]ORHR_COL (Reference-LAPACK PR 827)

Extend LAPACK tests for error exit sysv/sytd2/gehd2 (Reference-LAPACK PR 795)

* Fix typos in comments and documentation (Reference-LAPACK PR 820)

Fix typos in comments of LAPACK sources (Reference-LAPACK PR 814)

Fix typos in LAPACK comments (Reference-LAPACK PRs 809,811,812)

* Add Neoverse build with OpenMP

* 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