test/zlib/test_zlib.rb: stop a failure on armv7l

The platform defines a constant File::TMPFILE, but it seems unavailable
(maybe depending on the file system?).

http://rubyci.s3.amazonaws.com/scw-9d6766/ruby-master/log/20210322T171707Z.fail.html.gz

This change adds some rescue cluases to the test, copied from
test/ruby/test_file.rb.

test/zlib/test_zlib.rb

@@ -743,6 +743,12 @@ if defined? Zlib
           gz0.close
           gz1.close
         end
+      rescue Errno::EINVAL
+        skip 'O_TMPFILE not supported (EINVAL)'
+      rescue Errno::EISDIR
+        skip 'O_TMPFILE not supported (EISDIR)'
+      rescue Errno::EOPNOTSUPP
+        skip 'O_TMPFILE not supported (EOPNOTSUPP)'
       end
     end
   end