update SDL_mixer to SDL3_mixer 3.2.0

libs/SDL3_mixer/mingw/pkg-support/cmake/sdl3_mixer-config-version.cmake

@@ -0,0 +1,19 @@
+# SDL3_mixer CMake version configuration file:
+# This file is meant to be placed in a cmake subfolder of SDL3_mixer-devel-3.x.y-mingw
+
+if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+    set(sdl3_mixer_config_path "${CMAKE_CURRENT_LIST_DIR}/../i686-w64-mingw32/lib/cmake/SDL3_mixer/SDL3ConfigVersion.cmake")
+elseif(CMAKE_SIZEOF_VOID_P EQUAL 8)
+    set(sdl3_mixer_config_path "${CMAKE_CURRENT_LIST_DIR}/../x86_64-w64-mingw32/lib/cmake/SDL3_mixer/SDL3ConfigVersion.cmake")
+else("${CMAKE_SIZEOF_VOID_P}" STREQUAL "")
+    set(PACKAGE_VERSION_UNSUITABLE TRUE)
+    return()
+endif()
+
+if(NOT EXISTS "${sdl3_mixer_config_path}")
+    message(WARNING "${sdl3_mixer_config_path} does not exist: MinGW development package is corrupted")
+    set(PACKAGE_VERSION_UNSUITABLE TRUE)
+    return()
+endif()
+
+include("${sdl3_mixer_config_path}")