revert f45f339ef9

revert deps: update SDL2 and FFmpeg versions

Update bundled dependencies to their latest stable versions:
- SDL2: 2.28.2 -> 2.30.12
- FFmpeg: 6.0 -> 6.1.2

Also add citron copyright header to FFmpeg CMakeLists.txt

CMakeLists.txt

@@ -390,7 +390,7 @@ if (ENABLE_SDL2)
     if (CITRON_USE_BUNDLED_SDL2)
         # Detect toolchain and platform
         if ((MSVC_VERSION GREATER_EQUAL 1920) AND ARCHITECTURE_x86_64)
-            set(SDL2_VER "SDL2-2.30.12")
+            set(SDL2_VER "SDL2-2.28.2")
         else()
             message(FATAL_ERROR "No bundled SDL2 binaries for your toolchain. Disable CITRON_USE_BUNDLED_SDL2 and provide your own.")
         endif()

externals/ffmpeg/CMakeLists.txt

@@ -1,5 +1,4 @@
 # SPDX-FileCopyrightText: 2021 yuzu Emulator Project
-# SPDX-FileCopyrightText: 2025 citron Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 if (NOT WIN32 AND NOT ANDROID)
@@ -255,7 +254,7 @@ elseif(ANDROID)
     set(FFmpeg_INCLUDE_DIR "${FFmpeg_INCLUDE_DIR}" PARENT_SCOPE)
 elseif(WIN32)
     # Use citron FFmpeg binaries
-    set(FFmpeg_EXT_NAME "ffmpeg-6.1.2")
+    set(FFmpeg_EXT_NAME "ffmpeg-6.0")
     set(FFmpeg_PATH "${CMAKE_BINARY_DIR}/externals/${FFmpeg_EXT_NAME}")
     download_bundled_external("ffmpeg/" ${FFmpeg_EXT_NAME} "")
     set(FFmpeg_FOUND YES)