qt: Fix for Linuxbrew
qt: Fix for Linuxbrew

Disable PlistBuddy.

Closes Linuxbrew/linuxbrew#724

Linuxbrew/linuxbrew,DoomHammer/linuxbrew,SuperNEMO-DBD/cadfaelbrew,Angeldude/linuxbrew,Homebrew/linuxbrew,saketkc/linuxbrew,reelsense/linuxbrew,bukzor/linuxbrew,SuperNEMO-DBD/cadfaelbrew,SuperNEMO-DBD/cadfaelbrew,Homebrew/linuxbrew,Linuxbrew/linuxbrew,Homebrew/linuxbrew,drbenmorgan/linuxbrew,drbenmorgan/linuxbrew,reelsense/linuxbrew,SuperNEMO-DBD/cadfaelbrew,gnubila-france/linuxbrew,saketkc/linuxbrew,ebouaziz/linuxbrew,gnubila-france/linuxbrew,sjackman/linuxbrew,Angeldude/linuxbrew,Linuxbrew/linuxbrew,drbenmorgan/linuxbrew,sjackman/linuxbrew,bukzor/linuxbrew,ebouaziz/linuxbrew,drbenmorgan/linuxbrew,reelsense/linuxbrew,reelsense/linuxbrew,gnubila-france/linuxbrew,Linuxbrew/linuxbrew,DoomHammer/linuxbrew,ebouaziz/linuxbrew,sjackman/linuxbrew,Angeldude/linuxbrew,bukzor/linuxbrew,saketkc/linuxbrew,DoomHammer/linuxbrew,DoomHammer/linuxbrew,saketkc/linuxbrew,ebouaziz/linuxbrew,bukzor/linuxbrew,Homebrew/linuxbrew,Angeldude/linuxbrew,sjackman/linuxbrew,gnubila-france/linuxbrew