Fix build on Solaris with cc.
Fix build on Solaris with cc.

* SConstruct: Don't add -Wdeclaration-after-statement and -Wmissing-prototypes
              warning flags on Solaris, cc doesn't support them.

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