govendor: Fix for Linuxbrew
govendor: Fix for Linuxbrew

Signed-off-by: Kazuki Suda <7503a71bc156cfc0db6c791efd79e4ef2a2ebf99@gmail.com>

Linuxbrew/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,maxim-belkin/homebrew-core