* ruby.c (fill_standard_fds): new function to open closed standard
file descriptors.
(ruby_sysinit): call fill_standard_fds.
* ruby.c (fill_standard_fds): use fstat() instead of fcntl(F_GETFD)
for MinGW. reported by Luis Lavena. [ruby-core:40526] [Bug #5516]
merge revision(s) 33567,33573:
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34452 b2dd03c8-39d4-4d8f-98ff-823fe69b080e