Define snprintf for older versions of MSVC

for #1677

Revert "Rewrite &= -> = and simplify the initial blocking phase."

Add cpuid for AMD Ryzen 2

Double MAX_ALLOCATING_THREADS to fix segfaults with Go and Octave

for #1664

Add -march=skylake-avx512 to AVX512 compile check and suppress its ou…

for #1641

Fix typo that broke compilation with DYNAMIC_ARCH and NO_AVX2

fixes 1659

Handle NOFORTRAN=0

Fix apparent off-by-one error in calculation of MAX_ALLOCATING_THREADS

Add compiler option to avx512 test and hide test output

fixes #1641

Disable the 16x2 DTRMM kernel on SkylakeX as well

Disable the AVX512 DGEMM kernel for now

Add DYNAMIC_LIST option for user-defined list of dynamic targets

due to #1643

Remove premature exits from ARMV7 xdot codes

Revert changes to NOFORTRAN handling in Makefile

merge develop

Merge xianyi:develop into develop

Rewrite &= -> = and simplify the initial blocking phase.

Expose the CBLAS interface to the IxAMIN functions and have make build it

Fix data races reported by TSAN.

This is handy for people not using lapack.

- Compiler TLS is now used only used when the compiler supports it
- If compiler TLS is unsupported, we use platform-specific TLS
- Only one variable (an index) is now in TLS
- We only access TLS once per alloc, and never when freeing
- Allocation / release info is now stored within the allocation itself, by
  over-allocating; this saves having external structures do the bookkeeping, and
  reduces some of the redundant data that was being stored (such as addresses)
- We never hit the alloc lock when not using SMP or when using OpenMP (that was
  my fault)
- Now that there are fewer tracking structures I think this is a bit easier to
  read than before

Add -march=skylake-avx512 to flags if target is skylake x