99-pkglint: forbid /usr/etc

data files should go to /usr/share, config files should go to /etc

common/hooks/pre-pkg/99-pkglint.sh

@@ -22,7 +22,7 @@ hook() {
 		fi
 	done
 
-	for f in var/run usr/local; do
+	for f in var/run usr/local usr/etc; do
 		if [ -d ${PKGDESTDIR}/${f} ]; then
 			msg_red "${pkgver}: /${f} directory is not allowed, remove it!\n"
 			error=1

common/wrappers/which.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+ret=0
+
+while test $# != 0; do
+	case "$1" in
+	-*)	;;
+	*) command -v "$1" || ret=1 ;;
+	esac
+	shift
+done
+
+exit "$ret"