RUBY_PROGRAM_VERSION from RUBY_VERSION
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53477 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
RUBY_PROGRAM_VERSION from RUBY_VERSION
RUBY_VERSION in version.h instead of RUBY_API_VERSION numbers in
include/ruby/version.h, and cut it into version numbers.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53477 b2dd03c8-39d4-4d8f-98ff-823fe69b080e