buildroot

libnetfilter_acct: remove autoreconf

Since commit b8d446cd56dc (libnetfilter_acct: bump to version 1.0.3,
2016-08-23) we no longer patch configure.ac.

Cc: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>