Ruby

Remove the teeny part from the shared library name on macOS

This will prevent macOS users from having to rebuild all extension
libraries every time they upgrade ruby to a new teeny release.

Before:

• libruby.2.6.0.dylib
• libruby.2.6.dylib -> libruby.2.6.0.dylib
• libruby.dylib -> libruby.2.6.0.dylib

After:

• libruby.2.6.dylib
• libruby.dylib -> libruby.2.6.dylib

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63300 b2dd03c8-39d4-4d8f-98ff-823fe69b080e