Improve input argument checks of gemmt

* Add Apple m1/iphoneos (cross)build

Remove unused variable SMIN from ?BDSQR (Reference-LAPACK PR 832)

Fix potential segfault in LAPACKE S/DGEESX (Reference-LAPACK PR 836)

* Fix return value for invalid info
* Add missing checks for ldA, ldB
* Use reference-LAPACK like checks (ie ld=0,nrows=0 is invalid)

CI: run apt-get update before fetching cross-compilers in gh workflow

Add quick return from SLARUV/DLARUV for N < 1 (Reference-LAPACK PR 837)

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)