Bug#1010595: xsimd: Bug#1010595 Please make xsimd available on all platforms

[Drew Parsons]

I don't know myself which xsimd test is which in order to implement the 
scalar test division discussed in upstream Issue#756. For sure upstream 
will know.

While we're resolving that, one simple thing we could do temporarily for 
the packaging is to restrict the CI tests to only run on the known 
vector-supported arches.  This can be done with just an Architecture: 
field added to the Test entries in debian/tests/control.

e.g. could copy the restricted Architecture line from debian/control 
over to the two tests in debian/tests/control, and then update 
debian/control to Architecture: any.

Drew