Added support for Motion JPEG camera capture

Fixes https://github.com/libsdl-org/SDL/issues/12183

build-scripts/check_stdlib_usage.py

@@ -161,6 +161,7 @@ def find_symbols_in_file(file: pathlib.Path) -> int:
         "src/libm",
         "src/hidapi",
         "src/video/khronos",
+        "src/video/stb_image.h",
         "include/SDL3",
         "build-scripts/gen_audio_resampler_filter.c",
         "build-scripts/gen_audio_channel_conversion.c",