Add encoding to Strings
As part of adding Ruby 1.9 support we need to associate the encoding
for Ruby's strings from the server. This approach is similar to Sven's
(in changelist 257263), where everything but the 'content' charset was
set to 'utf8'. The content charset is picked up from P4CHARSET and this
is used to translate any file content.
Also disabled the Ruby 1.9 warning for each compile.
User visible change to be documented in release notes.