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Avoid allocating the transposed triangular matrix in LAPACKE_xlantr_work (Reference-LAPACK 382)

Initialize X and Y to zero for N=0 in xGGGLM (Reference-LAPACK PR463)

Handle norm NaN value in xGESDD (Reference LAPACK PR471)

Fix possible division by zero in LAPACK xTGSJA (Reference-LAPACK PR502)

Apply MKL team fixes to the LAPACKE interfaces (Reference-LAPACK PR 534)

Add casts to prevent overflow of intermediate results

Removed spurious checks for INFO in xLACPY,xLASET after routines not returning any,and redundant requirements for ldvt in xGESVD_WORK

x86: Enable Intel CET

When Intel CET is enabled, we need to include <cet.h> in assembly codes
to mark Intel CET support and place _CET_ENDBR at the function entry.

Import packing improvements to LAPACK xLAQR from Reference-LAPACK (PR 480+535)

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Correct INFO value returned by SLASQ2/DLASQ2 (Reference-LAPACK 506)

Fix division by zero in the non-x86 codepath of C/ZROTG

Add LAPACKE fixes from Reference-LAPACK PR 537

Apply fixes from Reference-LAPACK PR468 and 539 for array declarations in ?ORGBR/?UNGBR

Apply lapack-testing fix from Reference-LAPACK PR536

fixes changing back from a single OMP thread for error exit testing to the originally requested number of threads for computational tests

Apply lapack-testing fixes from Reference-LAPACK PR538

Delay creation of the (soft)link until after the library has been built

Replace spurious AVX512 requirement in the Haswell drot microkernel with an AVX2/FMA3 guard

* Add mixed clang/ifort build on OSX to the Azure CI config based on https://github.com/oneapi-src/oneapi-ci
(and remove debugging tools from the clang+gfortran job)

* Remove extraneous libgfortran dependency of ifort builds

* remove FEXTRALIB from link line of shared library as ifort keeps track of dependencies (and they are different for a .dylib than what f_check got for an executable)

rebase

Fix obscure ctest crashes on OSX and add OSX builds to Azure CI

rebase