ports/158827: devel/rubygem-rdoc: fix compatibility with ruby 1.8

[Stanislav Sedov]

> RDoc 3.6 is still compatible with ruby 1.8, although it was lately marked as BROKEN for ruby 1.8. > The NetBSD guys have fixed the problem for pkgsrc:

It actually installs fine for me if I just kill the
RUBY_VER=	1.9
line.

-- 
Stanislav Sedov
ST4096-RIPE

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