Issue 9: Cleaning test/serf_spider.o fails.
Issue 9: Cleaning test/serf_spider.o fails.

* Makefile.in
  (clean): Remove trailing whitespace.

Submitted by: noritadak
Reviewed by: Justin

muthusuba/serf,SirJson/serf,wzugang/serf,wzugang/serf,sworda/serf,yesoce/serf,KyleSanderson/serf,Manouchehri/serf,zhupan/serf,zhengcq315/serf,soufianeEL/serf,TommyU/serf,TommyU/serf,krime/serf,Manouchehri/serf,TommyU/serf,pengdu/serf,Manouchehri/serf,stoneCC/serf,wzugang/serf,blueszhangsh/serf,KyleSanderson/serf,muthusuba/serf,justinweb/serf,x-clone/serf,idomon/serf,krime/serf,justinweb/serf,zhengcq315/serf,alex1818/serf,zhupan/serf,justinweb/serf,yesoce/serf,pengdu/serf,blueszhangsh/serf,liuzongquan/serf,soufianeEL/serf,stoneCC/serf,zhupan/serf,x-clone/serf,liuzongquan/serf,x-clone/serf,google-code-export/serf,blueszhangsh/serf,muthusuba/serf,justinweb/serf,x-clone/serf,sworda/serf,pengdu/serf,TommyU/serf,liuzongquan/serf,SirJson/serf,sworda/serf,yesoce/serf,idomon/serf,SirJson/serf,zhengcq315/serf,alex1818/serf,blueszhangsh/serf,alex1818/serf,google-code-export/serf,google-code-export/serf,lazysoez/serf,liuzongquan/serf,soufianeEL/serf,zhengcq315/serf,Manouchehri/serf,sworda/serf,wzugang/serf,lazysoez/serf,idomon/serf,KyleSanderson/serf,krime/serf,alex1818/serf,SirJson/serf,krime/serf,stoneCC/serf,lazysoez/serf,google-code-export/serf,pengdu/serf,stoneCC/serf,yesoce/serf,idomon/serf,KyleSanderson/serf,lazysoez/serf,soufianeEL/serf,muthusuba/serf,zhupan/serf