test/cmd/install: Fix a test failure on Linux
test/cmd/install: Fix a test failure on Linux

Fix the error:
Error: Homebrew GCC requested, but formula gcc not found!

mahori/brew,JCount/brew,konqui/brew,konqui/brew,Homebrew/brew,konqui/brew,konqui/brew,claui/brew,EricFromCanada/brew,Homebrew/brew,vitorgalvao/brew,DomT4/brew,EricFromCanada/brew,JCount/brew,vitorgalvao/brew,JCount/brew,Linuxbrew/brew,EricFromCanada/brew,sjackman/homebrew,sjackman/homebrew,claui/brew,Linuxbrew/brew,EricFromCanada/brew,nandub/brew,ilovezfs/brew,mahori/brew,Homebrew/brew,mahori/brew,Linuxbrew/brew,mgrimes/brew,sjackman/homebrew,Homebrew/brew,mahori/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,sjackman/homebrew,claui/brew,nandub/brew,nandub/brew,maxim-belkin/brew,nandub/brew,MikeMcQuaid/brew,claui/brew,MikeMcQuaid/brew,JCount/brew,maxim-belkin/brew,mgrimes/brew,vitorgalvao/brew,DomT4/brew,ilovezfs/brew,Linuxbrew/brew,DomT4/brew,maxim-belkin/brew,reitermarkus/brew,reitermarkus/brew,reitermarkus/brew,mgrimes/brew,reitermarkus/brew,vitorgalvao/brew,DomT4/brew,ilovezfs/brew