Update library versions.

* SDL to 2.0.22
* OpenAL-soft to 1.22.0
* zlib to 1.2.12
* FreeType to 2.12.1

Makefile

@@ -11,18 +11,18 @@ CMAKE_URL := https://github.com/Kitware/CMake/releases/download/v3.20.2/cmake-3.
 
 # Project branches (for git-based projects)
 LOVE_BRANCH := main
-SDL2_BRANCH := release-2.0.20
+SDL2_BRANCH := release-2.0.22
 LUAJIT_BRANCH := v2.1
-OPENAL_BRANCH := 1.21.1
+OPENAL_BRANCH := 1.22.0
 BROTLI_BRANCH := v1.0.9
-ZLIB_BRANCH := v1.2.11
+ZLIB_BRANCH := v1.2.12
 
 # Project versions (for downloadable tars)
 LIBOGG_VERSION := 1.3.5
 LIBVORBIS_VERSION := 1.3.7
 LIBTHEORA_VERSION := 1.2.0alpha1
 LIBPNG_VERSION := 1.6.37
-FT_VERSION := 2.11.1
+FT_VERSION := 2.12.1
 BZIP2_VERSION := 1.0.8
 MPG123_VERSION := 1.29.3
 LIBMODPLUG_VERSION := 0.8.8.5