Remove OP_SSL_SKIP_CERTIFICATE_CHECK from opusfile_example.

a7c5b93c flipped the argument to it from true to false, since it
 made certificate checking actually work.
This commit removes the option entirely to avoid encouraging people
 to use it now that that checking does work.

seeking_example still disables checking (since it's not really
 needed).

examples/opusfile_example.c

@@ -128,7 +128,7 @@ int main(int _argc,const char **_argv){
   }
   else{
     /*Try to treat the argument as a URL.*/
-    of=op_open_url(_argv[1],&ret,OP_SSL_SKIP_CERTIFICATE_CHECK(0),NULL);
+    of=op_open_url(_argv[1],&ret,NULL);
 #if 0
     if(of==NULL){
       OpusFileCallbacks  cb={NULL,NULL,NULL,NULL};