Mp4: fixed setting wrong mdat atom size in very rare cases. Atom size is the sum of atom header size and atom data size. The specification says that the first 4 bytes are set to one when the atom size is greater than the maximum unsigned 32-bit value. Which means atom header size should be considered when the comparison takes place between atom data size and 0xffffffff.

# Copyright (C) Nginx, Inc.


if [ $USE_THREADS = YES ]; then

    if [ "$NGX_PLATFORM" = win32 ]; then
        cat << END

$0: --with-threads is not supported on Windows

END
        exit 1
    fi

    have=NGX_THREADS . auto/have
    CORE_DEPS="$CORE_DEPS $THREAD_POOL_DEPS"
    CORE_SRCS="$CORE_SRCS $THREAD_POOL_SRCS"
    CORE_LIBS="$CORE_LIBS -lpthread"
fi