eval.c: Backport #2592 [ruby-core:27525]; Added an ifndef for WIN32 so that F_GETFD isn't used on that platform. Fixes a build issue.
dln.c: Bug #2220 [ruby-core:26117]; Patch to fix dln.c so that extensions work properly under Snow Leopard.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_6@26361 b2dd03c8-39d4-4d8f-98ff-823fe69b080e