Many tests are failing on non-amd64 architectures

[rbalint]

In Debian we build rb-gsl for many architectures and most of them are failing:
https://buildd.debian.org/status/package.php?p=ruby-gsl&suite=unstable

BTW I'm the new maintainer of the package and wanted to say Hi. :-)

[blackwinter]

Welcome! :)

Most of these test failures seem to be precision-related (eigen_test.rb:432, dht_test.rb:72) or invalid memory accesses (oper_test.rb:50). The other one (sf_test.rb:27 on armhf, clobbered by debian/ruby-tests.rb:14) requires further investigation.