Add CC, CFLAGS, LINKFLAGS, LIBS and CPPFLAGS variables to the scons script.
Add CC, CFLAGS, LINKFLAGS, LIBS and CPPFLAGS variables to the scons script.

* SConstruct:
  (_converter,
   RawListVariable): New functions, read comma separated list from cmdline.
  (opts.AddVariables): Add new variables CC, CFLAGS, LINKFLAGS, LIBS and
      CPPFLAGS. Add this to the variables the script alreade generates per 
      platform.

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