Only build the arches required by the version of ruby run against ext/extconf.rb
Only build the arches required by the version of ruby run against ext/extconf.rb

MikaelSmith/ffi,tduehr/ffi,mvz/ffi,ferventcoder/ffi,MikaelSmith/ffi,ferventcoder/ffi,mvz/ffi,tduehr/ffi,yghannam/ffi,mvz/ffi,mvz/ffi,MikaelSmith/ffi,sparkchaser/ffi,ffi/ffi,sparkchaser/ffi,majioa/ffi,ferventcoder/ffi,yghannam/ffi,ffi/ffi,majioa/ffi,sparkchaser/ffi,sparkchaser/ffi,majioa/ffi,ferventcoder/ffi,tduehr/ffi,tduehr/ffi,yghannam/ffi,ffi/ffi,MikaelSmith/ffi,yghannam/ffi,majioa/ffi,yghannam/ffi