Fix issue #121: scons CFLAGS doesn't accept more than one flag.
Fix issue #121: scons CFLAGS doesn't accept more than one flag.

* SConstruct: Make CFLAGS, LIBS, LINKFLAGS and CPPFLAGS take a space-separated 
      list so that flags like "-Wl,-foo,fooval" can be specified.

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