rsyslog: doesn't need largefile/wchar

This was added in 9b4696a4 but only partially removed in d89a2610
leading to a comment and the rsyslog option both being present in the
config menu if we're using a non-LFS toolchain.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>