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• Makefile.in (PLATFORM_DIR): add a variable for win32 directory.

• Makefile.in (clean-platform): add new target.
  It cleans win32 directory.

• common.mk (clean): add a dependency for win32 directory.

• common.mk (distclean): ditto.

• common.mk (distclean-platform): add new target.
  It cleans win32 directory.

• common.mk ($(PLATFORM_D)): add new target to make win32 directory.

• common.mk (win32/win32.$(OBJEXT)): move win32.o into win32
  directory.

• common.mk (win32/file.$(OBJEXT)): add new target for win32/file.c.

• configure.in: move win32.o into win32 directory and add
  win32/file.o to MISSING.

• file.c (file_load_ok, rb_file_load_ok): replace static
  file_load_ok() with public rb_file_load_ok().
  It's to link Windows implementation in win32/file.c.

• file.c (rb_find_file_ext_safe): ditto.

• file.c (rb_find_file_safe): ditto.

• win32/file.c (rb_file_load_ok): new file. Add Windows specific
  optimized implementation of rb_file_load_ok(). We created a
  separated file to avoid too many #ifdef macro which is unreadable.

• win32/Makefile.sub (PLATFORM_DIR): add a variable for win32
  directory.

• win32/Makefile.sub (MISSING): move win32.obj into win32
  directory and add win32/file.obj to MISSING.

• win32/Makefile.sub (MAKEDIRS): replace MINIRUBY with BASERUBY.
  It's because miniruby doesn't exist when making win32 directory.

• win32/Makefile.sub (clean-platform): add new target to clean win32
  directory.

• win32/Makefile.sub ({$(srcdir)}.c{}.obj): make it not match
  win32/file.c to build properly.

• win32/Makefile.sub (win32/win32.$(OBJEXT)): move win32.obj into
  win32 directory.

  Patch created with Luis Lavena.
  [ruby-core:42480] [Feature #5999]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34849 b2dd03c8-39d4-4d8f-98ff-823fe69b080e