Remove absurd warning message for ruby.
Remove absurd warning message for ruby.

* configure.ac:
  Ruby 1.9 support is hardly new now and only warning when using exactly 1.9.3
  is silly.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1593992 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion