Take in account c-ares 1.6.1 will use __declspec function decoration

for Win32 and Symbian unless CARES_STATICLIB is defined to use static
library linkage.

lib/urldata.h

@@ -115,7 +115,11 @@
 #endif
 
 #ifdef USE_ARES
-#include <ares.h>
+#  if defined(CURL_STATICLIB) && !defined(CARES_STATICLIB) && \
+     (defined(WIN32) || defined(_WIN32) || defined(__SYMBIAN32__))
+#    define CARES_STATICLIB
+#  endif
+#  include <ares.h>
 #endif
 
 #include <curl/curl.h>