md-to-man.do: redo-ifcreate on possible paths to pandoc

This way, if you run

  ./redo
  $PKGMGR install pandoc
  ./redo

you'll still wind up with man pages.

Documentation/md-to-man.do

@@ -1,6 +1,7 @@
 if pandoc </dev/null 2>/dev/null; then
 	echo 'pandoc -s -r markdown -w man -o $3 $1.md'
 else
+	(IFS=:; for DIR in $PATH; do redo-ifcreate "$DIR/pandoc"; done)
 	echo "Warning: pandoc not installed; can't generate manpages." >&2
 	echo 'echo Skipping: $1.1 >&2'
 fi