* SConstruct: Add -Wmissing-prototypes compiler option in both release and debug   builds (just as we already add -Wall to both).
* SConstruct: Add -Wmissing-prototypes compiler option in both release and debug
  builds (just as we already add -Wall to both).

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