Make possible to use clang on Windows (clang-cl)

-DWITH_ASAN can be used as well now, on x64

Fix many clang-cl warnings.

sql/udf_example.c

@@ -112,6 +112,11 @@
 **
 */
 
+#ifdef _WIN32
+/* Silence warning about deprecated functions , gethostbyname etc*/
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
+#endif
+
 #ifdef STANDARD
 /* STANDARD is defined, don't use any mysql functions */
 #include <stdlib.h>
@@ -139,14 +144,6 @@ typedef long long longlong;
 #include <mysql.h>
 #include <ctype.h>
 
-#ifdef _WIN32
-/* inet_aton needs winsock library */
-#pragma comment(lib, "ws2_32")
-#if _MSC_VER
-/* Silence warning about deprecated functions , gethostbyname etc*/
-#pragma warning(disable : 4996)
-#endif
-#endif
 
 #ifdef HAVE_DLOPEN