Fix built-in package "unsafe" bug.
Fix built-in package "unsafe" bug.

It was caused by wrong addition of this package to a cache.

toqueteos/LightTable-Go,louiseGrandjonc/gocode,beni55/gocode,mdempsky/gocode,artnez/gocode,lmh008/gocode,mem/gocode,lmh008/gocode,TheBB/gocode,kerr-huang/Gocode,syohex/gocode,syohex/gocode,MerlinDMC/gocode,TheBB/gocode,beni55/gocode,artnez/gocode,MerlinDMC/gocode,fjl/gocode,thousandhigh/gocode,toqueteos/LightTable-Go,ghiden/gocode,mem/gocode,ghiden/gocode,nsf/gocode,artnez/gocode,syohex/gocode,beni55/gocode,artnez/gocode,nsf/gocode,ghiden/gocode,ghiden/gocode,thousandhigh/gocode,MerlinDMC/gocode,mem/gocode,mdempsky/gocode,fjl/gocode,suncycheng/gocode,fjl/gocode,kerr-huang/Gocode,kerr-huang/Gocode,suncycheng/gocode,thousandhigh/gocode,mattn/gocode,mdempsky/gocode,mattn/gocode,TheBB/gocode,nsf/gocode,mattn/gocode,louiseGrandjonc/gocode,TheBB/gocode,kerr-huang/Gocode,mattn/gocode,suncycheng/gocode,nsf/gocode,mem/gocode,suncycheng/gocode,lmh008/gocode,thousandhigh/gocode,lmh008/gocode,louiseGrandjonc/gocode,louiseGrandjonc/gocode,fjl/gocode,MerlinDMC/gocode,syohex/gocode,beni55/gocode