Fix compiler errors

examples/engine/blocking_server.c

@@ -51,10 +51,10 @@ static void produce_response(HTTP_Engine *eng)
 	http_engine_status(eng, 200);
 
 	// Set zero or more headers
-	http_engine_header(eng, "Server: tinyhttp", -1);
+	http_engine_header(eng, HTTP_STR("Server: tinyhttp"));
 
 	// Set some bytes in the body
-	http_engine_body(eng, "Hello, world!", 13);
+	http_engine_body(eng, HTTP_STR("Hello, world!"));
 
 	// This is one difference from the http_response_XXX API.
 	// It's possible to write response content directly into

examples/engine/iocp_server.c

@@ -1,3 +1,5 @@
+#ifdef _WIN32
+
 #include <winsock2.h>
 #include <ws2tcpip.h>
 #include <mswsock.h>
@@ -222,4 +224,16 @@ int main(void)
 	}
 	
 	return 0;
-}
+}
+
+#else
+
+#include <stdio.h>
+
+int main(void)
+{
+    printf("This example only works on windows!\n");
+    return -1;
+}
+
+#endif