openssl: fix keypress requirement in apps on win32

Re-applying commit 153784b3489e2feb9d93a3a5eee5a4aa34f74e39, which
was overwritten by the update to openssl 1.0.1f.

Original source:

http://openssl.6102.n7.nabble.com/PATCH-s-client-Fix-keypress-requirement-with-redirected-input-on-Windows-td46787.html