DEVELOPERS: drop Sven Neumann

His e-mail address has been bouncing for quite some time:

From: thomas.petazzoni@bootlin.com To: neumann@teufel.de
212.91.255.190[212.91.255.190] reply 550 5.1.10 RESOLVER.ADR.RecipientNotFound

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit b97b9a59897e6d9ae2fc6ddbb86a3e00c33dc9f3)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -2250,13 +2250,6 @@ N:	Sven Haardiek <sven.haardiek@iotec-gmbh.de>
 F:	package/lcdproc/
 F:	package/python-influxdb/
 
-N:	Sven Neumann <neumann@teufel.de>
-F:	package/glib-networking/
-F:	package/gstreamer1/gst1-libav/
-F:	package/libmms/
-F:	package/orc/
-F:	package/wampcc/
-
 N:	Sven Oliver Moll <svolli@svolli.de>
 F:	package/most/