Bug#1010595: #1013568 scipy: FTBFS: conjugate.hpp:22:36: error: type/value mismatch at argument 2 in template parameter list for ‘template<class T, class A> class xsimd::batch’

[Drew Parsons]

Control: reopen 1010595
Control: forwarded 1010595 
https://github.com/xtensor-stack/xsimd/issues/756
Control: block 1013568 by 1010595 1012437

A number of upgrades including scipy got interrupted by the upgrade of 
xsimd to v8.  We're working through the transition now. scipy needs a 
working pythran but pythran needs xsimd available on all arches, even 
those without specific vector acceleration hardware (in which case xsimd 
scalar mode is used). We need to reconfigure xsimd tests to not attempt 
vector-mode functionality on unsupported arches.