sync code with last improvements from OpenBSD

dist/xkeyboard-config/rules/merge.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+INDIR=`dirname $0`
+DEST=$1
+shift
+
+if [ -z "$HDR" ]; then
+    HDR="HDR"
+fi
+
+basename=`basename $0`
+echo "// DO NOT EDIT THIS FILE - IT WAS AUTOGENERATED BY $basename FROM rules/*.part" >$DEST
+
+for i in $*; do
+  if [ "$i" = "$HDR" ] || [ "$i" = "HDR" ]; then
+    echo >> $DEST;
+    read hdr
+    echo "$hdr" >> $DEST
+  elif test -f $i; then
+    cat $i >> $DEST || exit 1
+  else
+    cat $INDIR/$i >> $DEST || exit 1
+  fi
+done < $HDR
+