SDL_image: fix build with clang 16

Use the correct function pointer types to avoid incompatible function pointer type assignment errors with clang 16. Also disable `webp-shared` like the other image formats already do and add it as an explicit dependency.

pkgs/by-name/sd/SDL_image/clang16-webp-errors.patch

@@ -0,0 +1,16 @@
+diff -ur a/IMG_webp.c b/IMG_webp.c
+--- a/IMG_webp.c	2012-01-20 20:51:33.000000000 -0500
++++ b/IMG_webp.c	2024-07-24 20:48:58.697398200 -0400
+@@ -47,9 +47,9 @@
+ static struct {
+ 	int loaded;
+ 	void *handle;
+-	int/*VP8StatuCode*/ (*webp_get_features_internal) (const uint8_t *data, uint32_t data_size, WebPBitstreamFeatures* const features, int decoder_abi_version);
+-	uint8_t*	(*webp_decode_rgb_into) (const uint8_t* data, uint32_t data_size, uint8_t* output_buffer, int output_buffer_size, int output_stride);
+-	uint8_t*	(*webp_decode_rgba_into) (const uint8_t* data, uint32_t data_size, uint8_t* output_buffer, int output_buffer_size, int output_stride);
++	VP8StatusCode	(*webp_get_features_internal) (const uint8_t *data, size_t data_size, WebPBitstreamFeatures* const features, int decoder_abi_version);
++	uint8_t*	(*webp_decode_rgb_into) (const uint8_t* data, size_t data_size, uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
++	uint8_t*	(*webp_decode_rgba_into) (const uint8_t* data, size_t data_size, uint8_t* output_buffer, size_t output_buffer_size, int output_stride);
+ } lib;
+ 
+ #ifdef LOAD_WEBP_DYNAMIC

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

@@ -8,6 +8,7 @@
   libjpeg,
   libpng,
   libtiff,
+  libwebp,
   pkg-config,
   stdenv,
 }:
@@ -29,6 +30,8 @@ stdenv.mkDerivation (finalAttrs: {
       includes = [ "IMG_xcf.c" ];
       hash = "sha256-Z0nyEtE1LNGsGsN9SFG8ZyPDdunmvg81tUnEkrJQk5w=";
     })
+    # Fixes incompatible function pointer type errors with clang 16
+    ./clang16-webp-errors.patch
   ];
 
   configureFlags = [
@@ -37,6 +40,7 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.enableFeature false "jpg-shared")
     (lib.enableFeature false "png-shared")
     (lib.enableFeature false "tif-shared")
+    (lib.enableFeature false "webp-shared")
     (lib.enableFeature (!stdenv.isDarwin) "sdltest")
   ];
 
@@ -52,9 +56,13 @@ stdenv.mkDerivation (finalAttrs: {
     libjpeg
     libpng
     libtiff
+    libwebp
   ];
 
-  outputs = [ "out" "dev" ];
+  outputs = [
+    "out"
+    "dev"
+  ];
 
   strictDeps = true;
 
@@ -62,8 +70,7 @@ stdenv.mkDerivation (finalAttrs: {
     homepage = "http://www.libsdl.org/projects/SDL_image/";
     description = "SDL image library";
     license = lib.licenses.zlib;
-    maintainers = lib.teams.sdl.members
+    maintainers = lib.teams.sdl.members ++ (with lib.maintainers; [ ]);
-                  ++ (with lib.maintainers; [ ]);
     inherit (SDL.meta) platforms;
   };
 })