Fix libheif build on emscripten4 (emscripten-forge#4366)

Co-authored-by: Alexis Placet <2400067+Alex-PLACET@users.noreply.github.com>

Author: Alex-PLACET

recipes/recipes_emscripten/libheif/fix-emscripten-val-set.patch

@@ -0,0 +1,23 @@
+diff --git a/libheif/api/libheif/heif_emscripten.h b/libheif/api/libheif/heif_emscripten.h
+index 1234567..abcdefg 100644
+--- a/libheif/api/libheif/heif_emscripten.h
++++ b/libheif/api/libheif/heif_emscripten.h
+@@ -335,15 +335,8 @@ emscripten::val heif_js_decode_image2(struct heif_image_handle* handle, heif_co
+   if (err.code != heif_error_Ok) {
+     return emscripten::val(err);
+   }
+-
+-#if __EMSCRIPTEN_major__ > 4 ||   \
+-    (__EMSCRIPTEN_major__ == 4 && \
+-     (__EMSCRIPTEN_minor__ > 0 || __EMSCRIPTEN_tiny__ >= 9))
+-  result.set("image", image, emscripten::allow_raw_pointers());
+-#else
+-  result.set("image", image);
+-#endif
+-
++
++  result.set("image", emscripten::val(image, emscripten::allow_raw_pointers()));
++
+   int width = heif_image_handle_get_width(handle);
+   result.set("width", width);
+ 

recipes/recipes_emscripten/libheif/recipe.yaml

@@ -1,14 +1,16 @@
 context:
   name: libheif
-  version: 1.20.2
+  version: 1.21.2
 
 package:
   name: ${{ name }}
   version: ${{ version }}
 
 source:
   url: https://github.com/strukturag/libheif/releases/download/v${{ version }}/libheif-${{ version }}.tar.gz
-  sha256: 68ac9084243004e0ef3633f184eeae85d615fe7e4444373a0a21cebccae9d12a
+  sha256: 75f530b7154bc93e7ecf846edfc0416bf5f490612de8c45983c36385aa742b42
+  patches:
+  - fix-emscripten-val-set.patch # Fixes error: 'val_set' was not declared in this scope, to remove when https://github.com/strukturag/libheif/pull/1565 is merged
 
 build:
   number: 0