SDL_mixer: cmake: fix vendored build with static SDL3_mixer using libFLAC

SDL Commits
1 
From 3cd621b191a46c11adf3b9b09b7d3052c0b41f2b Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 13 Oct 2023 14:21:53 +0200
Subject: [PATCH] cmake: fix vendored build with static SDL3_mixer using
 libFLAC

---
 CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 287a9794..4f2c8c12 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -642,7 +642,7 @@ if(SDL3MIXER_FLAC_LIBFLAC)
         message(STATUS "Using vendored libflac")
         sdl_check_project_in_subfolder(external/flac libflac SDL3MIXER_VENDORED)
         add_subdirectory(external/flac EXCLUDE_FROM_ALL)
-        if(SDL3MIXER_FLAC_LIBFLAC_SHARED)
+        if(SDL3MIXER_FLAC_LIBFLAC_SHARED OR NOT SDL3MIXER_BUILD_SHARED_LIBS)
             list(APPEND INSTALL_EXTRA_TARGETS FLAC)
         endif()
         if(NOT SDL3MIXER_FLAC_LIBFLAC_SHARED)