* SConstruct: restore build of test/serf_bwtp, after accidental drop in r2002
* SConstruct: restore build of test/serf_bwtp, after accidental drop in r2002

stoneCC/serf,alex1818/serf,soufianeEL/serf,google-code-export/serf,zhengcq315/serf,soufianeEL/serf,yesoce/serf,x-clone/serf,alex1818/serf,pengdu/serf,pengdu/serf,google-code-export/serf,SirJson/serf,alex1818/serf,SirJson/serf,SirJson/serf,soufianeEL/serf,google-code-export/serf,yesoce/serf,KyleSanderson/serf,KyleSanderson/serf,yesoce/serf,zhupan/serf,zhupan/serf,alex1818/serf,stoneCC/serf,zhengcq315/serf,x-clone/serf,x-clone/serf,zhupan/serf,lazysoez/serf,stoneCC/serf,google-code-export/serf,KyleSanderson/serf,pengdu/serf,SirJson/serf,yesoce/serf,zhengcq315/serf,lazysoez/serf,zhupan/serf,stoneCC/serf,soufianeEL/serf,lazysoez/serf,KyleSanderson/serf,x-clone/serf,pengdu/serf,lazysoez/serf,zhengcq315/serf