fix compile error on Windows

base/hplatform.h

@@ -108,7 +108,9 @@
 
 #pragma warning (disable: 4018) // signed/unsigned comparison
 #pragma warning (disable: 4100) // unused param
+#pragma warning (disable: 4244) // conversion loss of data
 #pragma warning (disable: 4251) // STL dll
+#pragma warning (disable: 4267) // size_t => int
 #pragma warning (disable: 4819) // Unicode
 #pragma warning (disable: 4996) // _CRT_SECURE_NO_WARNINGS
 

examples/http_client_test.cpp

@@ -58,7 +58,7 @@ int main() {
 
         test_http_sync_client();
 
-        sleep(1);
+        hv_delay(1000);
     }
 
     // demo wait async ResponseCallback