runruby.rb: run rdoc, test and so on with compiled extension
libraries. [ruby-dev:22688]
* ext/extmk.rb, lib/mkmf.rb: make extension libraries in separated
directory, similar to the actual directory structure.
* lib/fileutils.rb (FileUtils.copy_file): use the mode of the original
file to create new file.
* lib/rdoc/ri/ri_paths.rb (RI::Paths::SYSDIR): get rid of unexpected
influence by envirionment variable.
* bcc32/configure.bat, win32/configure.bat: add install-doc options.
* win32/win32.c, win32/win32.h (rb_w32_fstat): fix Borland C runtime
bug which returns wrong mode. [ruby-dev:22846]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@5659 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
