configure.in: downloader needs BASERUBY

* configure.in: try downloader only if BASERUBY is working.  use
  tarballs to build without BASERUBY.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48040 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
tool/unicode_norm_gen.rb: for 1.8.5 BASERUBY

* tool/unicode_norm_gen.rb: get rid of new features for 1.8.5
  BASERUBY.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48041 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
unicode_norm_gen.rb: get rid of hard coded paths

* common.mk (lib/unicode_normalize/tables.rb): run at top srcdir.

* tool/unicode_norm_gen.rb: add -input and -output options to set
  InputDataDir and OuputDataDir respectively.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48042 b2dd03c8-39d4-4d8f-98ff-823fe69b080e