dependencies: add workaround for sdl2_image, so that it's installable

Author: Totto16

subprojects/packagefiles/SDL2_image-2.6.3_install.diff

@@ -0,0 +1,12 @@
+diff --git a/meson.build b/meson.build
+index 728eea8..221edf9 100644
+--- a/meson.build
++++ b/meson.build
+@@ -153,6 +153,7 @@ sdl2_image_lib = library(
+   objc_args: full_library_args,
+   dependencies: deps,
+   gnu_symbol_visibility: 'hidden',
++  install: true
+ )
+ 
+ depinc = include_directories('.')

subprojects/sdl2_image.wrap

@@ -9,5 +9,9 @@ patch_hash = 1741274f30b5b88299b2588a498a54a4203861ec1fa64c3bf99b359a6b618354
 source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/sdl2_image_2.6.3-2/SDL2_image-2.6.3.tar.gz
 wrapdb_version = 2.6.3-2
 
+# TODO: remove once this is merged inot the wrapdb
+# see https://github.com/mesonbuild/wrapdb/pull/1737
+diff_files = SDL2_image-2.6.3_install.diff
+
 [provide]
 sdl2_image = sdl2_image_dep