$NetBSD: patch-build_shave.in,v 1.1 2019/10/01 12:25:37 nia Exp $

Fix shell script.

--- build/shave.in.orig	2010-01-18 14:18:12.000000000 +0200
+++ build/shave.in	2010-01-18 14:19:29.000000000 +0200
@@ -57,7 +57,8 @@
         preserved_args="$preserved_args $opt"
         ;;
     -out:*|/out:*)
-        lt_output="${opt:5}"
+        lt_output="${opt#-out:}"
+        lt_output="${lt_output#/out:}"
         preserved_args="$preserved_args $opt"
         ;;
     *)