linenoise() always returns -1 on UserLAnd

[cosmos72]

UserLAnd is an Android app to install stock Linux distributions on a smartphone.
For example, I use it to have a native Debian GNU/Linux arm64 development system on my phone.

Unluckily, on such system tcsetattr(fd,TCSAFLUSH, ...) fails with errno = EPERM, causing linenoise() to immediately return -1 without reading from the terminal.

As a workaround, I had to replace it with tcsetattr(fd,TCSANOW, ...)

Does it make sense to always use TCSANOW instead of TCSAFLUSH ?