net/netdiscover: update to 0.21

While here:
- sort variable order to make portclippy happy
- remove GNU_CONFIGURE_MANPREFIX now defaulted to ${PREFIX}/share

Changelog: https://github.com/netdiscover-scanner/netdiscover/blob/0.21/ChangeLog

PR:		288927
Reported by:	Tiago Gasiba <[email protected]> (maintainer)

Author: tjemg

net/netdiscover/Makefile

@@ -1,7 +1,7 @@
 PORTNAME=	netdiscover
-DISTVERSION=	0.11
-MASTER_SITES=	https://github.com/netdiscover-scanner/netdiscover/releases/download/${DISTVERSION}/
+DISTVERSION=	0.21
 CATEGORIES=	net
+MASTER_SITES=	https://github.com/netdiscover-scanner/netdiscover/releases/download/${DISTVERSION}/
 
 MAINTAINER=	[email protected]
 COMMENT=	Network address discovering tool
@@ -13,7 +13,6 @@ LICENSE_FILE=	${WRKSRC}/COPYING
 USES=		autoreconf tar:bz2
 
 GNU_CONFIGURE=	yes
-GNU_CONFIGURE_MANPREFIX=	${PREFIX}/share
 
 PLIST_FILES=	sbin/netdiscover \
 		share/man/man8/netdiscover.8.gz

net/netdiscover/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1743206028
-SHA256 (netdiscover-0.11.tar.bz2) = bb984d15a3b1807db1dfa11101fc4022434e805e3e3a54971a764382dca7891c
-SIZE (netdiscover-0.11.tar.bz2) = 406881
+TIMESTAMP = 1755525776
+SHA256 (netdiscover-0.21.tar.bz2) = dd587649fd06319f6b7218e5735db17436e620f4d06b5f337709af2e6935fc18
+SIZE (netdiscover-0.21.tar.bz2) = 416432