Fix determining GSL version with subprocess call to gsl-config on windows (fixes #331) following Henry's suggestion
Fix determining GSL version with subprocess call to gsl-config on windows (fixes #331) following Henry's suggestion

Co-authored-by: Henry Leung <b8c2b735a9ac4148746a9402d50634f20c253ab3@gmail.com>

jobovy/galpy,jobovy/galpy,jobovy/galpy,jobovy/galpy