DEVELOPERS: remove Marcin Nowakowski, e-mail is bouncing

<marcin.nowakowski@imgtec.com>: host
    mxa-00376f01.gslb.pphosted.com[185.132.180.163] said: 550 5.1.1 User
    Unknown (in reply to RCPT TO command)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

DEVELOPERS

@@ -1430,9 +1430,6 @@ F:	package/murata-cyw-fw/
 F:	package/rs485conf/
 F:	package/turbolua/
 
-N:	Marcin Nowakowski <marcin.nowakowski@imgtec.com>
-F:	package/libkcapi/
-
 N:	Marcus Folkesson <marcus.folkesson@gmail.com>
 F:	package/libostree/
 F:	package/libselinux/