Add ruby16-shim-ruby18, version 184.108.40.2062.05.21.
Ruby Shim is a set of modules that provide the libraries and the
additional features that will appear in the next version of Ruby.
Shim between 1.6 and 1.8 includes:
features/ruby18 Hooks to support ruby 1.8 extensions
dl Interface to dynamic linker
racc-runtime Racc runtime module
stringio IO interface for String
strscan Fast string scanner
benchmark Benchmark module
fileutils File & directory manipulation
pp Pretty printer (prettier version of `p')
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