cmake: use *_STATIC_* variables when linking to a static ffmpeg

test/CMakeLists.txt

@@ -184,9 +184,8 @@ endif()
 
 set(FFmpeg_FIND_COMPONENTS AVCODEC AVFORMAT AVUTIL SWSCALE)
 include("${SDL3_SOURCE_DIR}/cmake/FindFFmpeg.cmake")
-if(FFMPEG_FOUND)
+if(FFmpeg_FOUND)
     add_sdl_test_executable(testspriteffmpeg NO_C90 SOURCES testspriteffmpeg.c ${icon_bmp_header})
-    target_include_directories(testspriteffmpeg PRIVATE ${FFMPEG_INCLUDE_DIRS})
     target_link_libraries(testspriteffmpeg PRIVATE ${FFMPEG_LIBRARIES})
 else()
     message(STATUS "Cannot find ffmpeg, skipping testspriteffmpeg")