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build: Fix usage of install

Prefix is a mandatory argument and not a switch. This
commit also includes a simplification of the use of
prefix in the shell script.

--- a/scripts/install

+++ b/scripts/install

@@ -11,22 +11,22 @@

 		;;

 	-*)

 		echo 1=$1

-		echo usage: install -t prefix [-p proto] >&2

+		echo usage: install [-p proto] prefix >&2

 		exit 1

 		;;

 	esac

 done

-prefix=$1

+prefix=${1?'prefix missed'}

 while read type perm name

 do

 	case $type in

 	d)

-		mkdir -p ${prefix?}/$name

+		mkdir -p $prefix/$name

 		;;

 	f)

-		cp $name ${prefix?}/$name

+		cp $name $prefix/$name

 		;;

 	*)

 		echo install: wrong entry type >&2