A patch block depends on gpatch for Linuxbrew
A patch block depends on gpatch for Linuxbrew

Copy the gpatch formula from Homebrew/dupes to avoid a circular
dependency with git.

Closes Linuxbrew/linuxbrew#605
Closes Linuxbrew/linuxbrew#804

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