[Bug libstdc++/69881] with gcc-6 of today building gcc-4.9 fails

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69881

--- Comment #17 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
Created attachment 37749
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37749&action=edit
prerequisite patch to make c_std headers compile

not perfect, but probably an improvement...