sdcc: fix build with gcc15 (#471797)

pkgs/by-name/sd/sdcc/package.nix

@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchurl,
+  fetchpatch,
   autoconf,
   bison,
   boost,
@@ -70,6 +71,16 @@ stdenv.mkDerivation (finalAttrs: {
     gputils
   ];
 
+  patches = [
+    # Fix build with gcc15
+    # https://sourceforge.net/p/sdcc/bugs/3846/
+    (fetchpatch {
+      name = "sdcc-fix-aslink-elf-signature.patch";
+      url = "https://src.fedoraproject.org/rpms/sdcc/raw/4a7c2a7e32369461eb451fc6f4d678a010135afc/f/sdcc-4.4.0-aslink.patch";
+      hash = "sha256-xGilNetecPBj2VV3ebmln5BKqs3OoWFf6y2S3TBTHMQ=";
+    })
+  ];
+
   # sdcc 4.5.0 massively rewrote sim/ucsim/Makefile.in, and lost the `.PHONY`
   # rule in the process. As a result, on macOS (which uses a case-insensitive
   # filesystem), the INSTALL file keeps the `install` target in the ucsim