adblock: fix restrictive sort selection

Signed-off-by: Dirk Brenken <dev@brenken.org>

net/adblock/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=adblock
 PKG_VERSION:=4.0.8
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_LICENSE:=GPL-3.0-or-later
 PKG_MAINTAINER:=Dirk Brenken <dev@brenken.org>
 

net/adblock/files/adblock.sh

@@ -1653,7 +1653,11 @@ fi
 adb_sort="$(command -v gnu-sort)"
 if [ -z "${adb_sort}" ]
 then
-	f_log "err" "gnu-sort not found"
+	adb_sort="$(command -v sort)"
+	if [ -z "$("${adb_sort}" --help 2>/dev/null | grep -Fo -m1 "coreutils")" ]
+	then
+		f_log "err" "coreutils sort not found"
+	fi
 fi
 
 # version information