libnss: remove upstream patch

libnss: remove upstream patch

The merge of the next branch failed to remove an upstream applied patch.

Fixes:
http://autobuild.buildroot.net/results/31f/31fe428584ada680f30d11e5d1abfbc533c0a70e/
http://autobuild.buildroot.net/results/bb2/bb25363497dfd7fd5f8a81c28110fab87d5c2dc8/
http://autobuild.buildroot.net/results/70a/70adacf85154d2a663808cf0db69849b6a490457/

Cc: Joseph Kogut <joseph.kogut@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>