Fixed a minor cmake problem, occuring when DYNAMIC_ARCH=ON and CMAKE_C_FLAGS was empty

Add support for NetBSD by adding it to the existing xBSD conditionals

Both forms are seen on NetBSD (#2288)

Improve support for g95 and non-GNU ld

Fix netlib 3.7/3.8 function enumeration for linktest

Optimize RPCC function on ARM64

Fixup x86 cpuid changes from #2283

Auto-add "-fno-second-underscore" option to make LAPACKE compile (as it calls LAPACK functions that may have gotten a second underscore added otherwise). Also support -R for rpath when parsing compiler directives in f_check

to allow linktest to pass with a compiler that adds a second underscore to such names

as I find conflicting information on accessibility from non-priviledged processes

* Fix source typo

Found via `codespell -q 3 -L amin,als,ba,dum,mone,nd,nto,orign -S Changelog.txt,./lapack*`

* Remove beta-thread function per request

#2283 had inadvertently removed Goldmont+, and cpuid was reporting a mix of Core2 and Pentium2 for some QEMU configurations

resync with upstream

AVX512 DGEMM kernel

90% MKL 1-thread performance.

Support QEMU virtual cpu in 64bit mode as CORE2 or BARCELONA

Some QEMU instances pretend to be "AuthenticAMD" with the same family 6/model 6 even when running on an Intel host
(could be related to qemu or libvirt version and/or kvm availability). Also fix the define to depend on __x86_64__ set by the
compiler, the defines using __64BIT__ will only work for getarch_2nd.

qemu itself claims it is a 64bit P6, which does not exist in the wild.

* Add automatic fixups for OSX/IOS cross-compilation

* Add OSX/IOS cross-compilation test to Travis CI

* Handle platforms that lack hwcap.h by falling back to ARMV8

* Fix PROLOGUE for OSX/IOS

Add overlooked part of IOS compilation fix

sync with upstream

Rewrite ARMV8 code to allow cross-compilation for IOS

Revert "Avoid taking root of negative number in symv_thread.c"

... which does not perform the automatic numbering on instantiation that the _@ suffix signifies

os version 10.13 "High Sierra" appears to be the oldest release now for which Homebrew provides a gcc package.
Anything older and the Travis job will run out of time building gcc from source

in response to Homebrew updates

Avoid taking root of negative number in symv_thread.c

This is similar to fixes in gh-1929, but there was one remaining
occurance of this type of pattern in the driver/level2/*_thread.c
files.