Fixes #6410,

Description of the feature or fix

I'm working on adding support to all draw task types, but I'm facing a cache related issue. The current code crashes in lv_example_buttonmatrix_1() if this line is enabled:

==34516==ERROR: AddressSanitizer: heap-use-after-free on address 0x60600001e100 at pc 0x559d6a5c9864 bp 0x7ffeda3e96c0 sp 0x7ffeda3e96b0
READ of size 4 at 0x60600001e100 thread T0
    #0 0x559d6a5c9863 in lv_cache_entry_get_ref ../lvgl/src/misc/cache/lv_cache_entry.c:71
    #1 0x559d6a5c79f8 in get_victim_cb ../lvgl/src/misc/cache/_lv_cache_lru_rb.c:420
    #2 0x559d6a5c91df in cache_evict_one_internal_no_lock ../lvgl/src/misc/cache/lv_cache.c:319
    #3 0x559d6a5c9414 in cache_add_internal_no_lock ../lvgl/src/misc/cache/lv_cache.c:342
    #4 0x559d6a5c86ea in lv_cache_acquire_or_create ../lvgl/src/misc/cache/lv_cache.c:173
    #5 0x559d6a7dd55f in draw_from_cached_texture ../lvgl/src/draw/sdl/lv_draw_sdl.c:406
    #6 0x559d6a7de33e in execute_drawing ../lvgl/src/draw/sdl/lv_draw_sdl.c:479

I'd like to immediately drop the cache in some case. In this case with text_local = 1 the label_draw_dsc->text will be freed later, so we cannot keep a reference to it in the draw_dsc saved in the cache..

Other thing: In sdl_texture_cache_compare_cb I'd like to compare text of the label draw dsc-s with strcmp and not by pointer value. Can I simply return return strcmp_res > 0 ? 1 : -1;?

cc @W-Mai

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