Also specify new `-X` syntax for go1.6
Also specify new `-X` syntax for go1.6

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