split from core version.  [ruby-dev:37748]

* configure.in (RUBY_LIB_PATH, etc): moved actual version
  dependent stuff to version.c.

* ruby.c (ruby_init_loadpath_safe): ditto.

* version.c (ruby_initial_load_paths): moved initial load path
  version depending on version from ruby.c.

* version.h (RUBY_VERSION_{MAJOR,MINOR,TEENY}): now mean library
  and API version, and reverted to 1.9.1.  [ruby-dev:37889]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22069 b2dd03c8-39d4-4d8f-98ff-823fe69b080e