numeric.c: no declaration of finite

* numeric.c (finite): disable declaration on Windows, which can be
  defined in ruby/win32.h.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43235 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32.c: bail out if no memory

* win32/win32.c (rb_w32_write_console): bail out when buffer
  allocation failed.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43236 b2dd03c8-39d4-4d8f-98ff-823fe69b080e