Build yuv_rgb_lsx.c with -mlsx

CMakeLists.txt

@@ -839,6 +839,7 @@ if(SDL_ASSEMBLY)
       cmake_pop_check_state()
 
       if(COMPILER_SUPPORTS_LSX AND HAVE_LSXINTRIN_H)
+        set_property(SOURCE "${SDL3_SOURCE_DIR}/src/video/yuv2rgb/yuv_rgb_lsx.c" APPEND PROPERTY COMPILE_OPTIONS "-mlsx")
         set(HAVE_LSX TRUE)
       endif()
     endif()