discontinued somewhat pointless "fixbookmarks": default output works sufficiently well;

--- a/src/Doc/Tutorial/document/build	Tue May 18 17:19:19 2021 +0200
+++ b/src/Doc/Tutorial/document/build	Tue May 18 19:49:06 2021 +0200
@@ -9,5 +9,4 @@
 isabelle latex -o bbl
 ./isa-index root
 isabelle latex -o "$FORMAT"
-[ -f root.out ] && "$ISABELLE_HOME/src/Doc/fixbookmarks" root.out
 isabelle latex -o "$FORMAT"

--- a/src/Doc/fixbookmarks	Tue May 18 17:19:19 2021 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,3 +0,0 @@
-#!/usr/bin/env bash
-
-perl -pi -e 's/\\([a-zA-Z]+)\s*/$1/g; s/\$//g; s/^BOOKMARK/\\BOOKMARK/g;' "$@"

--- a/src/Doc/prepare_document	Tue May 18 17:19:19 2021 +0200
+++ b/src/Doc/prepare_document	Tue May 18 19:49:06 2021 +0200
@@ -8,5 +8,4 @@
 isabelle latex -o bbl
 [ -f root.idx ] && "$ISABELLE_HOME/src/Doc/sedindex" root
 isabelle latex -o "$FORMAT"
-[ -f root.out ] && "$ISABELLE_HOME/src/Doc/fixbookmarks" root.out
 isabelle latex -o "$FORMAT"