gcc49: fix build for glibc>=2.28

Co-authored-by: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>

pkgs/development/compilers/gcc/4.9/default.nix

@@ -61,7 +61,13 @@ let majorVersion = "4";
     inherit (stdenv) buildPlatform hostPlatform targetPlatform;
 
     patches =
-      [ ../use-source-date-epoch.patch ../parallel-bconfig.patch ./parallel-strsignal.patch ]
+      [ ../use-source-date-epoch.patch ../parallel-bconfig.patch ./parallel-strsignal.patch
+        (fetchpatch {
+          name = "avoid-ustat-glibc-2.28.patch";
+          url = "https://gitweb.gentoo.org/proj/gcc-patches.git/plain/4.9.4/gentoo/100_all_avoid-ustat-glibc-2.28.patch?id=55fcb515620a8f7d3bb77eba938aa0fcf0d67c96";
+          sha256 = "0b32sb4psv5lq0ij9fwhi1b4pjbwdjnv24nqprsk14dsc6xmi1g0";
+        })
+      ]
       ++ optional (targetPlatform != hostPlatform) ../libstdc++-target.patch
       ++ optional noSysDirs ../no-sys-dirs.patch
       ++ optional langFortran ../gfortran-driving.patch