Only test cross-compilation on Go 1.7
Only test cross-compilation on Go 1.7

kurin/restic,fawick/restic,ckemper67/restic,arithmetric/restic,jayme-github/restic,ar-jan/restic,middelink/restic,byo/restic,jayme-github/restic,middelink/restic,stuertz/restic,kurin/restic,stuertz/restic,restic/restic,ar-jan/restic,restic/restic,fawick/restic,byo/restic