configure.ac: Rename shake/ to build/
configure.ac: Rename shake/ to build/

See https://github.com/snowleopard/shaking-up-ghc/pull/2

oldmanmike/ghc,oldmanmike/ghc,mcschroeder/ghc,sgillespie/ghc,nushio3/ghc,GaloisInc/halvm-ghc,oldmanmike/ghc,tjakway/ghcjvm,shlevy/ghc,mcschroeder/ghc,oldmanmike/ghc,shlevy/ghc,gridaphobe/ghc,oldmanmike/ghc,shlevy/ghc,nushio3/ghc,mcschroeder/ghc,vTurbine/ghc,shlevy/ghc,olsner/ghc,vTurbine/ghc,vikraman/ghc,sgillespie/ghc,nushio3/ghc,tjakway/ghcjvm,mcschroeder/ghc,sdiehl/ghc,mcschroeder/ghc,sdiehl/ghc,snoyberg/ghc,sgillespie/ghc,snoyberg/ghc,ezyang/ghc,mettekou/ghc,GaloisInc/halvm-ghc,mettekou/ghc,vTurbine/ghc,shlevy/ghc,GaloisInc/halvm-ghc,olsner/ghc,gridaphobe/ghc,nushio3/ghc,oldmanmike/ghc,gridaphobe/ghc,sgillespie/ghc,vikraman/ghc,olsner/ghc,mettekou/ghc,vikraman/ghc,olsner/ghc,mettekou/ghc,mettekou/ghc,GaloisInc/halvm-ghc,shlevy/ghc,gridaphobe/ghc,vikraman/ghc,ezyang/ghc,gridaphobe/ghc,tjakway/ghcjvm,sdiehl/ghc,gridaphobe/ghc,tjakway/ghcjvm,GaloisInc/halvm-ghc,nushio3/ghc,olsner/ghc,ezyang/ghc,vikraman/ghc,mettekou/ghc,ezyang/ghc,mcschroeder/ghc,tjakway/ghcjvm,sdiehl/ghc,snoyberg/ghc,snoyberg/ghc,GaloisInc/halvm-ghc,nushio3/ghc,nushio3/ghc,sdiehl/ghc,tjakway/ghcjvm,tjakway/ghcjvm,ezyang/ghc,snoyberg/ghc,vikraman/ghc,GaloisInc/halvm-ghc,vTurbine/ghc,sdiehl/ghc,ezyang/ghc,sgillespie/ghc,sgillespie/ghc,sdiehl/ghc,gridaphobe/ghc,vTurbine/ghc,vTurbine/ghc,oldmanmike/ghc,snoyberg/ghc,mettekou/ghc,mcschroeder/ghc,olsner/ghc,sgillespie/ghc,vTurbine/ghc,shlevy/ghc,olsner/ghc,vikraman/ghc,ezyang/ghc,snoyberg/ghc