DEVELOPERS: drop Stephan Hoffmann

His e-mail is no longer working:

<stephan.hoffmann@ext.grandcentrix.net>: host aspmx.l.google.com[74.125.133.26]
    said: 550-5.2.1 The email account that you tried to reach is disabled.
    Learn more at 550 5.2.1  https://support.google.com/mail/?p=DisabledUser
    o3si10331209wre.302 - gsmtp (in reply to RCPT TO command)

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

DEVELOPERS

@@ -2399,9 +2399,6 @@ F:	package/gtest/
 F:	package/mtdev/
 F:	package/mtdev2tuio/
 
-N:	Stephan Hoffmann <stephan.hoffmann@ext.grandcentrix.net>
-F:	package/libhttpserver/
-
 N:	Steve Calfee <stevecalfee@gmail.com>
 F:	package/python-pymysql/
 F:	package/python-pyratemp/