Fix sed error when $1, $2 or $3 contain special characters

gistfile1.txt

diff --git a/scripts/debian-update-versions b/scripts/debian-update-versions
index ae24849..dcdc76c 100755
--- a/scripts/debian-update-versions
+++ b/scripts/debian-update-versions
@@ -20,8 +20,11 @@ get_timestamp_commit()
 }
 
 do_subst() {
-    sed  -e "0,/^mpv (.*)/s/(.*)/($1)/" \
-       -e "s/^  \* local build.*/  \* local build with ffmpeg $2, libass $3/" \
+    parm1=$(echo "$1"|sed -e 's/[\/&]/\\&/g')
+    parm2=$(echo "$2"|sed -e 's/[\/&]/\\&/g')
+    parm3=$(echo "$3"|sed -e 's/[\/&]/\\&/g')
+    sed  -e "0,/^mpv (.*)/s/(.*)/($parm1)/" \
+       -e "s/^  \* local build.*/  \* local build with ffmpeg $parm2, libass $parm3/" \
        -e"s/\(^ -- Local User <localuser@localhost>\).*/\1  $(date -R)/" debian/changelog.TEMPLATE > debian/changelog
 }