importer: add additional Go 1.6 architectures
importer: add additional Go 1.6 architectures

Fixes #580

Bring gb's list of known processor architectures up to date with cmd/go.

hyper-carrot/gb,constabulary/gb,mopemope/gb,constabulary/gb,hyper-carrot/gb,constabulary/gb,mopemope/gb,mopemope/gb