encoding.c: defer code page table

* encoding.c (rb_locale_encindex): defer initialization of win32 code
  page table until encoding db loaded.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43362 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32/file.c: code page table

* win32/file.c (code_page): use simple array instead of st_table.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43363 b2dd03c8-39d4-4d8f-98ff-823fe69b080e