Fix Windows build when OPENSSL_STATIC is defined.
Fix Windows build when OPENSSL_STATIC is defined.

* serf.mak
  (TEST_LIBS): New define to hold list of system libraries required for 
   test programs.
  (serf_response.exe, serf_get.exe, serf_request.exe, test_all.exe): List 
   TEST_LIBS as link dependency.

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