Created attachment 1249123 [details]
Patch for suppress warnings

Description of problem:

This is fix to suppress below warning for Ruby 2.4.0.

```
+ ruby -Ilib -e 'Dir.glob "./test/test_{array,cache,helper,synchronized_delegator}.rb", &method(:require)'
...
/builddir/build/BUILD/thread_safe-0.3.5/usr/share/gems/gems/thread_safe-0.3.5/lib/thread_safe/cache.rb:155: warning: constant ::Fixnum is deprecated
.
Finished in 1.260279s, 45.2281 runs/s, 1811.5037 assertions/s.
57 runs, 2283 assertions, 0 failures, 0 errors, 0 skips
```

Upstream commit to fix it, is here.
https://github.com/ruby-concurrency/thread_safe/commit/8c929dc


Version-Release number of selected component (if applicable):
rubygem-thread_safe-0.3.5-3

I checked below tests.

- License check: ok
- rpmlint check: See attachment lint.log
- Install check: ok

I like it will be merged.
Thanks.