Getting ready for 2.1. (#1181)

* Getting ready for 2.1.

* Fixed version.

* Year.

* Manually added line as takase said to.

* Fixed minor issue at takase's behest.

* Dunno where that went.

* Updated to use a function pointer.

* OK, as discussed, adding this manually for now.

* Updated SDL.

subprojects/sdl2.wrap

@@ -1,12 +1,12 @@
 [wrap-file]
-directory = SDL2-2.24.0
-source_url = https://libsdl.org/release/SDL2-2.24.0.tar.gz
-source_filename = SDL2-2.24.0.tar.gz
-source_hash = 91e4c34b1768f92d399b078e171448c6af18cafda743987ed2064a28954d6d97
-patch_filename = sdl2_2.24.0-2_patch.zip
-patch_url = https://wrapdb.mesonbuild.com/v2/sdl2_2.24.0-2/get_patch
-patch_hash = ec296ed9a577b42131d2fdbfe5ca73a0cf133793c0290e1ccd825675464bfe32
-wrapdb_version = 2.24.0-2
+directory = SDL2-2.24.1
+source_url = https://github.com/libsdl-org/SDL/releases/download/release-2.24.1/SDL2-2.24.1.tar.gz
+source_filename = SDL2-2.24.1.tar.gz
+source_hash = bc121588b1105065598ce38078026a414c28ea95e66ed2adab4c44d80b309e1b
+patch_filename = sdl2_2.24.1-4_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/sdl2_2.24.1-4/get_patch
+patch_hash = effe31a11a8a0bd844ab11338519c40ed4460176c946236740ee65fc10aa4af0
+wrapdb_version = 2.24.1-4
 
 [provide]
 sdl2 = sdl2_dep