git: Fix bug building without perl for Linuxbrew
git: Fix bug building without perl for Linuxbrew

Closes Homebrew/linuxbrew#393

ebouaziz/linuxbrew,SuperNEMO-DBD/cadfaelbrew,lvicentesanchez/linuxbrew,drbenmorgan/linuxbrew,tdsmith/linuxbrew,afdnlw/linuxbrew,Angeldude/linuxbrew,tghs/linuxbrew,jack-and-rozz/linuxbrew,Gui13/linuxbrew,jwillemsen/linuxbrew,jbaum98/linuxbrew,ebouaziz/linuxbrew,caputomarcos/linuxbrew,SuperNEMO-DBD/cadfaelbrew,hyokosdeveloper/linuxbrew,jwillemsen/linuxbrew,tghs/linuxbrew,caputomarcos/linuxbrew,tdsmith/linuxbrew,digiter/linuxbrew,reelsense/linuxbrew,danabrand/linuxbrew,outcoldman/linuxbrew,arcivanov/linuxbrew,digiter/linuxbrew,tdsmith/linuxbrew,ebouaziz/linuxbrew,brevilo/linuxbrew,gnubila-france/linuxbrew,brevilo/linuxbrew,amenk/linuxbrew,jbaum98/linuxbrew,tjhei/linuxbrew,jack-and-rozz/linuxbrew,jbaum98/linuxbrew,outcoldman/linuxbrew,DoomHammer/linuxbrew,hyokosdeveloper/linuxbrew,DoomHammer/linuxbrew,romejoe/linuxbrew,IsmailM/linuxbrew,IsmailM/linuxbrew,Angeldude/linuxbrew,tomas/linuxbrew,tdsmith/linuxbrew,Homebrew/linuxbrew,adamliter/linuxbrew,caputomarcos/linuxbrew,tjhei/linuxbrew,danabrand/linuxbrew,adamliter/linuxbrew,Homebrew/linuxbrew,reelsense/linuxbrew,Homebrew/linuxbrew,princeofdarkness76/linuxbrew,drbenmorgan/linuxbrew,tghs/linuxbrew,tghs/linuxbrew,hyokosdeveloper/linuxbrew,tjhei/linuxbrew,Gui13/linuxbrew,gnubila-france/linuxbrew,Angeldude/linuxbrew,IsmailM/linuxbrew,jwillemsen/linuxbrew,afdnlw/linuxbrew,tomas/linuxbrew,arcivanov/linuxbrew,Linuxbrew/linuxbrew,princeofdarkness76/linuxbrew,jack-and-rozz/linuxbrew,Linuxbrew/linuxbrew,sjackman/linuxbrew,digiter/linuxbrew,digiter/linuxbrew,arcivanov/linuxbrew,adamliter/linuxbrew,davydden/linuxbrew,tomas/linuxbrew,reelsense/linuxbrew,Homebrew/linuxbrew,davydden/linuxbrew,DoomHammer/linuxbrew,bukzor/linuxbrew,bukzor/linuxbrew,caputomarcos/linuxbrew,brevilo/linuxbrew,Linuxbrew/linuxbrew,Linuxbrew/linuxbrew,tdsmith/linuxbrew,jbaum98/linuxbrew,sjackman/linuxbrew,gcstang/linuxbrew,outcoldman/linuxbrew,hyokosdeveloper/linuxbrew,saketkc/linuxbrew,sjackman/linuxbrew,saketkc/linuxbrew,amenk/linuxbrew,dholm/linuxbrew,ebouaziz/linuxbrew,dholm/linuxbrew,danabrand/linuxbrew,reelsense/linuxbrew,gnubila-france/linuxbrew,saketkc/linuxbrew,DoomHammer/linuxbrew,romejoe/linuxbrew,LeonB/linuxbrew,lvicentesanchez/linuxbrew,drbenmorgan/linuxbrew,drbenmorgan/linuxbrew,davydden/linuxbrew,bukzor/linuxbrew,danabrand/linuxbrew,Gui13/linuxbrew,digiter/linuxbrew,LeonB/linuxbrew,gcstang/linuxbrew,bukzor/linuxbrew,lvicentesanchez/linuxbrew,saketkc/linuxbrew,princeofdarkness76/linuxbrew,Gui13/linuxbrew,gnubila-france/linuxbrew,afdnlw/linuxbrew,amenk/linuxbrew,SuperNEMO-DBD/cadfaelbrew,tomas/linuxbrew,SuperNEMO-DBD/cadfaelbrew,Gui13/linuxbrew,dholm/linuxbrew,IsmailM/linuxbrew,sjackman/linuxbrew,tghs/linuxbrew,Angeldude/linuxbrew,lvicentesanchez/linuxbrew,afdnlw/linuxbrew,davydden/linuxbrew,adamliter/linuxbrew,romejoe/linuxbrew,LeonB/linuxbrew,gcstang/linuxbrew,amenk/linuxbrew