[Bug c++/68954] [5/6 Regression] -Wdeprecated-declarations warns for system header templates

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68954

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |5.2.0
   Target Milestone|---                         |5.4
      Known to fail|                            |5.3.0

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'm not caring very much about the 4.9 behavior but changing -Werror behavior
here on the branch is bad.