Allow users to define RUBY variable to utilize ruby ports with

custom-installed Ruby. :)

For instance, if you have built Ruby from the latest snapshot and
installed, you can install ruby modules from ports only by typing
"make RUBY=/usr/local/bin/ruby install".  bsd.ruby.mk will take care
of everything including RUBY_VER, RUBY_LIBDIR, CONFIGURE_TARGET, etc.

Introduce version requirement checking mechanism. You can set
RUBY_REQUIRE to any ruby expression(s) to check Ruby's version (or
other modules' versions, in future).  The result will be set in
RUBY_PROVIDED.

Define RUBY_VERSION_CODE which holds full integer version of Ruby.

Define RUBY_PORTVERSION, RUBY_DISTNAME and RUBY_WRKSRC for the
standard ruby ports so as not to change PORTVERSION, DISTNAME and
RUBY_WRKSRC of ruby, ruby-gdbm, ruby-tcltklib, ruby-tk, etc. everytime
Ruby is updated.

Rename RUBY_DEPENDS to DEPEND_RUBY, etc. for a cosmetic reason.

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