retroarch-free: fix with gcc15 (#477178)

pkgs/applications/emulators/libretro/cores/same_cdi.nix

@@ -30,6 +30,15 @@ mkLibretroCore {
     })
   ];
 
+  postPatch = ''
+    # Fix sol2 compatibility with GCC 15 (construct -> emplace)
+    # https://github.com/ThePhD/sol2/issues/1657
+    sed -i 's/this->construct(std::forward<Args>(args)\.\.\.);/this->emplace(std::forward<Args>(args)...);/g' 3rdparty/sol2/sol/sol.hpp
+
+    # Fix missing cstdint include for uint8_t
+    sed -i '1i #include <cstdint>' src/lib/util/corestr.cpp
+  '';
+
   extraNativeBuildInputs = [ python3 ];
   extraBuildInputs = [
     alsa-lib

pkgs/applications/emulators/libretro/cores/scummvm.nix

@@ -50,6 +50,9 @@ mkLibretroCore {
     cp -a ${libretro-deps-src}/* deps/libretro-deps
     chmod -R u+w deps/
 
+    # Fix conflicts with glibc index/rindex functions
+    sed -i 's/\bindex\b/faad_index/g; s/\brindex\b/faad_rindex/g' deps/libretro-deps/libfaad/libfaad/common.h
+
     patchShebangs ./scripts/*
   '';