GCC14 compat: Ignore several warnings

It looks like nixpkgs-unstable now uses GCC14, which converted several
warnings to errors
(https://gcc.gnu.org/gcc-14/porting_to.html#warnings-as-errors). Athena
code is very crufty, so we still need to treat them as warnings.

Author: dehnert

pkgs/discuss.nix

@@ -16,6 +16,10 @@ in stdenv.mkDerivation {
     hash = "sha256-0WPz6OeeIAd/c8zUD00f0gDhYwO3ll9qPENxqPTjPhk=";
   };
 
+  env = {
+    NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration -Wno-error=implicit-int -Wno-error=return-mismatch";
+  };
+
   meta = with lib; {
     description = "Project Athena forum system";
     homepage = "https://github.com/mit-athena/discuss";

pkgs/moira.nix

@@ -20,6 +20,10 @@ in stdenv.mkDerivation rec {
   };
   sourceRoot = "source/moira";
 
+  env = {
+    NIX_CFLAGS_COMPILE = "-Wno-error=implicit-function-declaration -Wno-error=implicit-int -Wno-error=return-mismatch";
+  };
+
   meta = with lib; {
     description = "Athena Service Management system";
     homepage = "https://github.com/mit-athena/moira";