8212000: Verify exported symbols in java.base (libnet, libnio/ch)

Reviewed-by: alanb, chegar

src/java.base/windows/native/libnet/net_util_md.c

@@ -903,7 +903,7 @@ NET_IsEqual(jbyte* caddr1, jbyte* caddr2) {
  * It returns the time left from the timeout, or -1 if it expired.
  */
 
-JNIEXPORT jint JNICALL
+jint
 NET_Wait(JNIEnv *env, jint fd, jint flags, jint timeout)
 {
     jlong prevTime = JVM_CurrentTimeMillis(env, 0);