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.

jandre/serf,jandre/serf,jandre/serf,jandre/serf