wrong number of ruby 1.9 args for portupgrade's realpath

[Andrey Chernov]

# portupgrade -vuR
/usr/local/lib/ruby/site_ruby/1.9/pkgmisc.rb:104:in `realpath': wrong 
number of arguments (2 for 1) (ArgumentError)
        from /usr/local/lib/ruby/1.9/pathname.rb:446:in `realpath'

'realpath' have 2 args in pathname.rb and 1 arg in pkgmisc.rb

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