Use \.v0 as backup_suffix. Eliminate uniq.

Use -u1 -I'^#[.,:~]' as diff option for *.po files.

maint/ldiff

@@ -3,10 +3,10 @@
 # This script makes pretty looking patches provided that the old files
 # are kept around with the .v0 suffix.
 
-: ${backup_suffix="v0"}
+: ${backup_suffix="\.v0"}
-backup_files=`find . -path "*.$backup_suffix" -type f | sort | uniq`
+backup_files=`find . -path "*$backup_suffix" -type f | sort -u`
 for oldfile in $backup_files; do
-  newfile=`echo $oldfile | sed 's,^\./,,;s,\.'$backup_suffix'$,,'`
+  newfile=`echo $oldfile | sed 's,^\./,,;s,'$backup_suffix'$,,'`
   oldlabel="$oldprefix$newfile"
   newlabel="$newprefix$newfile"
   find "$oldfile" ! -size 0 | grep . >/dev/null || \
@@ -15,6 +15,7 @@ for oldfile in $backup_files; do
     { newfile="/dev/null"; newlabel="/dev/null"; }
   case $newfile in
     *.c) dflags="-u -p" ;;
+    *.po) dflags="-u1 -I'^#[:,.~]'"
     *ChangeLog*) dflags="-u1" ;;
     *) dflags="-u" ;;
   esac