Implement Svn::Client::Context#propdel in terms of Svn::Client::Context#propset so we only have to maintain a single invocation of Client.propsetX.
Implement Svn::Client::Context#propdel in terms of
Svn::Client::Context#propset so we only have to maintain a single invocation
of Client.propsetX.

* subversion/bindings/swig/ruby/svn/client.rb
  (Svn::Client::Context#propdel): invoke Svn::Client::Context#propset with a
  nil property value.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@866926 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion