Fix gocode panic on windows with import "path/filepath".
Fix gocode panic on windows with import "path/filepath".

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