ruby ruby186 ruby19: additional program-suffix variants

[reynhout@…]

ruby and ruby186 currently have no program-suffix variants

ruby19 has "nosuffix" to install executables as "ruby" rather than default "ruby1.9", etc.

Suggestion is to add variants as follows:

• ruby186: +suffix186 ("ruby1.8.6", etc)
• ruby: +suffix18 ("ruby1.8", etc)

+suffix187 ("ruby1.8.7", etc)

• ruby19: +suffix191 ("ruby1.9.1", etc)

Justifications

• 1.8.7 will be the final 1.8, but there are some use cases for keeping 1.8.6 around, so it should be convenient for 1.8.6 and 1.8.7 to coexist.
• 1.9.1 is the current 1.9, but 1.9.2 is right around the corner, with significant changes, so having 1.9.1 and 1.9.2 coexistent is likely to be useful as well.

Peripherally, 1.9 should probably soon default to a suffixless install, and the other ports updated to reflect.

Trivial patches attached.

[reynhout@…]

diff -u ruby*/Portfile*