Build: Patch OIIO to not load plugins from (DY)LD_LIBRARY_PATH

This can cause crashes when loading incompatible plugins that happen to
be installed in one of the directories.

This change has been merged upstream, but there will likely be no stable
release in time for the next Blender release. So patch locally for now.

Fix #120480: Blender fails to launch on Steam on Arch Linux

Ref #118455

Pull Request: https://projects.blender.org/blender/blender/pulls/121136

build_files/build_environment/patches/openimageio.diff

@@ -21,3 +21,20 @@ diff -Naur orig/src/cmake/compiler.cmake external_openimageio/src/cmake/compiler
  endif (MSVC)
  
  if (${CMAKE_SYSTEM_NAME} STREQUAL "FreeBSD"
+diff --git a/src/libOpenImageIO/imageioplugin.cpp b/src/libOpenImageIO/imageioplugin.cpp
+index 9ad45042e..d2a0210ff 100644
+--- a/src/libOpenImageIO/imageioplugin.cpp
++++ b/src/libOpenImageIO/imageioplugin.cpp
+@@ -469,12 +469,6 @@ pvt::catalog_all_plugins(std::string searchpath)
+ 
+     std::unique_lock<std::recursive_mutex> lock(imageio_mutex);
+     append_if_env_exists(searchpath, "OIIO_LIBRARY_PATH", true);
+-#ifdef __APPLE__
+-    append_if_env_exists(searchpath, "DYLD_LIBRARY_PATH");
+-#endif
+-#if defined(__linux__) || defined(__FreeBSD__)
+-    append_if_env_exists(searchpath, "LD_LIBRARY_PATH");
+-#endif
+ 
+     size_t patlen = pattern.length();
+     std::vector<std::string> dirs;