[Bug libstdc++/65142] std::random_device Ignores Read Return Code (CVE-2015-5276)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65142

--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Do we want this on gcc-4_9-branch too?