fix shared and tests prereqs

* Add C conversions of the CBLAS tests for NOFORTRAN=1 builds

* Enable CTEST without Fortran and fix passing of BUILD_vartype options to exports/gensymbol

* Add C equivalents of the Fortran routines from Reference-LAPACK as fallbacks, and C_LAPACK variable to trigger their use

gcc also supports -O, -Og and -Os as optimization flags.
They may be given on the make command-line by users.

For the calculation of LAPACK_NOOPT, all such flags should be considered.

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
[Retrieved from:
https://git.buildroot.net/buildroot/tree/package/openblas/0003-Makefile-also-consider-Os-when-determining-LAPACK_NO.patch]
Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

OpenBLAS allows users to specify `FFLAGS` and then uses `override` to append additional
options. However, without such an override in lapack's make.inc, lapack would use the external
FFLAGS, rather than the ones being computed by OpenBLAS. For example the `DEBUG=1` flag
would not apply to LAPACK code. This is all a bit messy but forced by the integration with netlib
lapack. Note that `CFLAGS` already has this override for the same reason. It is possible that
other variables here should have a similar override, but I think for most of the other ones, OpenBLAS's
build system does not append to the flags passed in by the user.

fixes #2552

There is no difference in the way libnames are handle between FreeBSD
and linux or sunos. FreeBSD and DragonFly prefers having sonames as well

related to #2526

Fix use of make vs $(MAKE) in building lapack-testing

[Description]: check the compiler version and show the detail info

Broke lapack-testing on BSD as their default "make" does not support GNU Makefile syntax

[Description]:add c/fortran compiler version information in final note

* Update make.inc entries for LAPACK 3.9.0

Reference-LAPACK PR 347 changed some variable names and relative paths

* Update LAPACK to 3.9.0

* Add new functions from LAPACK 3.9.0

* Add new functions from LAPACK 3.9.0

* Restore LOADER command 

as it makes it easier to specify pthread as needed

* Restore LOADER

* Restore EIG/LIN prefixes in cmdbase

* add binary path to lapack_testing.py call

* Restore OpenMP version check

* Restore OpenMP version check

* Restore fix for out-of-bounds array accesses

from #2096

Thread safety tester using C++11 threading (cleaned history)

to avoid surprises from defining either as zero. Fixes #2035 by addressing some concerns from #1422

Handle conflicting usage of ARCH in at least some BSD environments

in case a conflicting setting of ARCH (for architecture) gets pulled in from the environment
(originally suggested by dloghin in #1753)

partial fix for #1574 - the problem with lapack_testing.py looks like an upstream bug

With this change, OpenBLAS builds and all tests pass on OpenBSD 6.2
using Clang. Tested on x86-64 only, with and without DYNAMIC_ARCH=1.