ior: fix gcc-15 build failure

Without the change thye build fails on `master` as
https://hydra.nixos.org/build/327774029:

```
option.c: In function 'option_parse_token':
option.c:325:19: error: too many arguments to function 'fp'; expected 0, have 1
  325 |                   fp(arg);
      |                   ^~ ~~~
```

ZHF: #516381

pkgs/by-name/io/ior/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   mpi,
   perl,
   autoreconfHook,
@@ -19,6 +20,16 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-WsfJWHHfkiHZ+rPk6ck6mDErTXwt6Dhgm+yqOtw4Fvo=";
   };
 
+  patches = [
+    # Fix gcc-15 build:
+    #   https://github.com/hpc/ior/pull/525
+    (fetchpatch {
+      name = "gcc-15.patch";
+      url = "https://github.com/hpc/ior/commit/526c5ad06695a91a27163c520ce3305109f50bef.patch";
+      hash = "sha256-HvbRMt2EcuO7kxLL9qKpozpNKEOmWuHkKQTSUhfU7/w=";
+    })
+  ];
+
   nativeBuildInputs = [
     autoreconfHook
     pkg-config