Rescue NotImplementedError for a test of Thread#native_thread_id

http://rubyci.s3.amazonaws.com/solaris10-gcc/ruby-master/log/20210526T070003Z.fail.html.gz
```
  1) Error:
TestThread#test_thread_native_thread_id:
NotImplementedError: native_thread_id() function is unimplemented on this machine
    /export/home/users/chkbuild/cb-gcc/tmp/build/20210526T070003Z/ruby/test/ruby/test_thread.rb:1338:in `native_thread_id'
    /export/home/users/chkbuild/cb-gcc/tmp/build/20210526T070003Z/ruby/test/ruby/test_thread.rb:1338:in `test_thread_native_thread_id'
```

1 files changed, 1 insertions, 1 deletions

diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index d87160a2a8..a16f066dc7 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -1335,7 +1335,7 @@ q.pop
   end
 
   def test_thread_native_thread_id
-    skip "don't support native_thread_id" unless (Thread.main.native_thread_id rescue nil)
+    skip "don't support native_thread_id" unless (begin; Thread.main.native_thread_id; rescue NotImplementedError; nil; end)
     assert_instance_of Integer, Thread.main.native_thread_id
 
     th1 = Thread.start{sleep}