* SConstruct: Support VPATH builds.
* SConstruct: Support VPATH builds.

idomon/serf,idomon/serf,sworda/serf,TommyU/serf,wzugang/serf,Manouchehri/serf,sworda/serf,justinweb/serf,justinweb/serf,krime/serf,muthusuba/serf,muthusuba/serf,justinweb/serf,blueszhangsh/serf,krime/serf,idomon/serf,liuzongquan/serf,liuzongquan/serf,wzugang/serf,sworda/serf,muthusuba/serf,TommyU/serf,Manouchehri/serf,idomon/serf,blueszhangsh/serf,krime/serf,sworda/serf,TommyU/serf,liuzongquan/serf,muthusuba/serf,blueszhangsh/serf,Manouchehri/serf,wzugang/serf,TommyU/serf,blueszhangsh/serf,justinweb/serf,Manouchehri/serf,krime/serf,liuzongquan/serf,wzugang/serf