os/mac: add Xcode 7.2.1
os/mac: add Xcode 7.2.1

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ttle/homebrew,sakra/homebrew,AlexejK/homebrew,yazuuchi/homebrew,esamson/homebrew,elgertam/homebrew,Angeldude/linuxbrew,sjackman/linuxbrew,kodabb/homebrew,LinusU/homebrew,pcottle/homebrew,alebcay/homebrew,ear/homebrew,cscetbon/homebrew,booi/homebrew,georgschoelly/homebrew,brunchboy/homebrew,decors/homebrew,hakamadare/homebrew,sakra/homebrew,bigbes/homebrew,saketkc/linuxbrew,MartinDelille/homebrew,cscetbon/homebrew,Linuxbrew/linuxbrew,optikfluffel/homebrew,skinny-framework/homebrew,lrascao/homebrew,sferik/homebrew,AlexejK/homebrew,emcrisostomo/homebrew,keith/homebrew,LinusU/homebrew,dickeyxxx/homebrew,dericed/homebrew,hakamadare/homebrew,OJFord/homebrew,optikfluffel/homebrew,mobileoverlord/homebrew-1,marcwebbie/homebrew,Asuranceturix/homebrew,ryanfb/homebrew,apjanke/homebrew,cprecioso/homebrew,bigbes/homebrew,TaylorMonacelli/homebrew,deorth/homebrew,DoomHammer/linuxbrew,Asuranceturix/homebrew,dplarson/homebrew,vigo/homebrew,saketkc/linuxbrew,dutchcoders/homebrew,mkrapp/homebrew,scorphus/homebrew,ablyler/homebrew,ablyler/homebrew,DoomHammer/linuxbrew,SteveClement/homebrew,joshfriend/homebrew,treyharris/homebrew,sferik/homebrew,reelsense/homebrew,sjackman/linuxbrew,dickeyxxx/homebrew,dutchcoders/homebrew,dericed/homebrew,Homebrew/linuxbrew,utzig/homebrew,yazuuchi/homebrew,mkrapp/homebrew,ralic/homebrew,dongcarl/homebrew,frodeaa/homebrew,Homebrew/homebrew,decors/homebrew,youtux/homebrew,influxdb/homebrew,johanhammar/homebrew,ExtremeMan/homebrew,theeternalsw0rd/homebrew,influxdata/homebrew,treyharris/homebrew,hanxue/homebrew,ear/homebrew,keith/homebrew,Angeldude/linuxbrew,tutumcloud/homebrew,kodabb/homebrew,afh/homebrew,bukzor/linuxbrew,scorphus/homebrew,scpeters/homebrew,Asuranceturix/homebrew,chadcatlett/homebrew,nandub/homebrew,DoomHammer/linuxbrew,SuperNEMO-DBD/cadfaelbrew,theeternalsw0rd/homebrew,tutumcloud/homebrew,reelsense/homebrew,filcab/homebrew,Red54/homebrew,Angeldude/linuxbrew,mobileoverlord/homebrew-1,royhodgman/homebrew,bukzor/linuxbrew,drewwells/homebrew,muellermartin/homebrew,Homebrew/homebrew,decors/homebrew,bukzor/linuxbrew,bukzor/linuxbrew,dericed/homebrew,BrewTestBot/homebrew,pcottle/homebrew,michaKFromParis/homebrew-sparks,influxdata/homebrew,jamer/homebrew,Red54/homebrew,totalvoidness/homebrew,reelsense/linuxbrew,benjaminfrank/homebrew,elyscape/homebrew,ebouaziz/linuxbrew,ExtremeMan/homebrew,pcottle/homebrew,galaxy001/homebrew,liamstask/homebrew,AlexejK/homebrew,sometimesfood/homebrew,ear/homebrew,dplarson/homebrew,MartinDelille/homebrew,georgschoelly/homebrew,thinker0/homebrew,kodabb/homebrew,sjackman/linuxbrew,hongkongkiwi/homebrew,SuperNEMO-DBD/cadfaelbrew