Fix Windows build.
Fix Windows build.

* serf.mak
  Add incoming.c and outgoing.c to link list.

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