cmake: use FindALSA.cmake to find ALSA libraries

Co-authored-by: nfarid <54642193+nfarid@users.noreply.github.com>

SDL3Config.cmake.in

@@ -30,6 +30,16 @@ if(EXISTS "${CMAKE_CURRENT_LIST_DIR}/SDL3testTargets.cmake")
   set(SDL3_SDL3_test_FOUND TRUE)
 endif()
 
+include("${CMAKE_CURRENT_LIST_DIR}/sdlfind.cmake")
+
+set(SDL_ALSA @SDL_ALSA@)
+set(SDL_ALSA_SHARED @SDL_ALSA_SHARED@)
+if(SDL_ALSA AND NOT SDL_ALSA_SHARED AND TARGET SDL2::SDL2-static)
+  sdlFindALSA()
+endif()
+unset(SDL_ALSA)
+unset(SDL_ALSA_SHARED)
+
 check_required_components(SDL3)
 
 # Create SDL3::SDL3 alias for static-only builds