Add workaround for omp_get_max_threads hanging on FreeBSD/LLVM14

* Move ?GELQS and ?GEQRS from TESTING/LIN to DEPRECATED (Reference-LAPACK PR 900)

* Add f2c-converted versions of ?GELQS and ?GEQRS

Improve matcopy interface

Move clang/gfortran OpenMP dependency rewriting out of f_check

Enable autodetection of Zen 3/4 cpus as their AVX512 Intel counterparts

Put more build information into Makefile.conf_last

* rows = 0 or cols = 0 is now a legal input and
  takes quick return path
* Follow BLAS/LAPACK convention that the leading
  dimensions must be at least 1.

Fix FCOMMON_OPT for power.  Error out for certain C and Fortran compiler combos on AIX

Only define __builtin_cpu_is and __builtin_cpu_supports if not present.

(Re)apply Makefile fix for supporting only a subset of precision types

Correct constant ALPHA in ?ORBDB6 (Reference-LAPACK PR 928)

Fix accumulation in LAPACK ?LASSQ (Reference-LAPACK PR 909)

Fix potential integer overflow in LAPACK C/ZBDSQR (Reference-LAPACK PR 927)

* Clean up ZROTG

Use SkylakeX ?ASUM microkernel for Cooperlake/Sapphirerapids as well

Fix outdated KERNEL files for SVE Cortex by aliasing to ARMV8SVE

Add dynamic dispatch to AIX and clang for Power

CirrusCI: Add FreeBSD clang/gfortran build with OpenMP

Increase the default GEMM buffer size on modern ARM server cpus

Clarify make/make install in the README and update the TARGET list there

POWER: AIX: Make use of power10 optimization