upload dgemv tester

make common functions more flexible, add vector fill function

Launching threads sequentially has a significant chance of giving a false negative. If an OMP parallel for construct is used to launch the concurrent calculations, then all threads start almost exactly at the same time, thus they have the highest chance of clashing.

this is a small program that uses C++11 threading to launch a bunch of concurrent BLAS/LAPACK calculations, to test the thread safety of the library

fixes #1974

* Tag arguments 0 and 1 as both input and output

* Tag arguments 0 and 1 as both input and output (see #1964)

* Tag operands 0 and 1 as both input and output

For #1964 (basically a continuation of coding problems first seen in #1292)

crot fix

Blas1 single missing kernels implemented with vector builtins

Fixed idamin,icamin choosing the first occurance index of equal minimals

Add support for Hygon Dhyana

Move TLS key deletion to openblas_quit

fixes #1954 (as suggested by thrasibule in that issue)

Query AVX2 and AVX512VL support when selecting x86 kernels

as homebrew seems to have dropped support for El Capitan in their gcc packages

More fixes for cross-compiling ARM64 targets

Fixed core naming for DYNAMIC_ARCH. Corrected GEMM_DEFAULT entries and added SYMV_P. Replaced outdated VULCAN define for ThunderX2T99 with ARMV8 to get basic definitions back. For issue #1908

the build will now abort with an error message when an undefined build TARGET is named

Fixes #1938