Get the test suite to build on Windows.
Get the test suite to build on Windows.

* SConstruct:
  - Use all 3 include files to generate public symbols list (serf.def)
  - link_rpath is not used in Windows
  - Add '/wd4100' compiler flag to reduce the number of unwanted warnings.
  - Construct CFLAGS as list instead of string. Remove space between /I and its
    value.
  - The test programs on Windows have the .exe extension.
  - Add object files for some internal functions to test_all.
  
zhengcq315/serf,SirJson/serf,soufianeEL/serf,x-clone/serf,alex1818/serf,zhupan/serf,x-clone/serf,alex1818/serf,zhupan/serf,google-code-export/serf,soufianeEL/serf,KyleSanderson/serf,stoneCC/serf,lazysoez/serf,stoneCC/serf,SirJson/serf,zhengcq315/serf,SirJson/serf,SirJson/serf,yesoce/serf,soufianeEL/serf,KyleSanderson/serf,google-code-export/serf,x-clone/serf,yesoce/serf,yesoce/serf,lazysoez/serf,lazysoez/serf,pengdu/serf,lazysoez/serf,google-code-export/serf,KyleSanderson/serf,KyleSanderson/serf,zhengcq315/serf,stoneCC/serf,google-code-export/serf,zhengcq315/serf,alex1818/serf,yesoce/serf,soufianeEL/serf,zhupan/serf,pengdu/serf,pengdu/serf,x-clone/serf,pengdu/serf,alex1818/serf,stoneCC/serf,zhupan/serf