cmake: Depends on bzip2 for Linuxbrew
cmake: Depends on bzip2 for Linuxbrew

Tested with vagrant hashicorp/precise64 image.

Closes Linuxbrew/linuxbrew#848.

Signed-off-by: Shaun Jackman <b580dab3251a9622aba3803114310c23fdb42900@gmail.com>

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