Fix CVE-2021-22204:

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22204

Patch extracted from commit cf0f4e7dcd024ca99615bfd1102a841a25dde031
from upstream source repository:

https://github.com/exiftool/exiftool/commit/cf0f4e7dcd024ca99615bfd1102a841a25dde031#diff-fa0d652d10dbcd246e6b1df16c1e992931d3bb717a7e36157596b76bdadb3800

diff --git a/lib/Image/ExifTool/DjVu.pm b/lib/Image/ExifTool/DjVu.pm
index c284d10..03b3f9f 100644
--- a/lib/Image/ExifTool/DjVu.pm
+++ b/lib/Image/ExifTool/DjVu.pm
@@ -18,7 +18,7 @@ use strict;
 use vars qw($VERSION);
 use Image::ExifTool qw(:DataAccess :Utils);
 
-$VERSION = '1.06';
+$VERSION = '1.07';
 
 sub ParseAnt($);
 sub ProcessAnt($$$);
@@ -227,10 +227,11 @@ Tok: for (;;) {
                 last unless $tok =~ /(\\+)$/ and length($1) & 0x01;
                 $tok .= '"';    # quote is part of the string
             }
-            # must protect unescaped "$" and "@" symbols, and "\" at end of string
-            $tok =~ s{\\(.)|([\$\@]|\\$)}{'\\'.($2 || $1)}sge;
-            # convert C escape sequences (allowed in quoted text)
-            $tok = eval qq{"$tok"};
+            # convert C escape sequences, allowed in quoted text
+            # (note: this only converts a few of them!)
+            my %esc = ( a => "\a", b => "\b", f => "\f", n => "\n",
+                        r => "\r", t => "\t", '"' => '"', '\\' => '\\' );
+            $tok =~ s/\\(.)/$esc{$1}||'\\'.$1/egs;
         } else {                # key name
             pos($$dataPt) = pos($$dataPt) - 1;
             # allow anything in key but whitespace, braces and double quotes
15e'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/patches/ganeti-drbd-compat.patch'>
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<div class='path'>path: <a href='/guix/log/?id=dbe607925a32f0dfc47550a4ddc3ec15bcb1115e'>root</a>/<a href='/guix/log/gnu?id=dbe607925a32f0dfc47550a4ddc3ec15bcb1115e'>gnu</a>/<a href='/guix/log/gnu/packages?id=dbe607925a32f0dfc47550a4ddc3ec15bcb1115e'>packages</a>/<a href='/guix/log/gnu/packages/patches?id=dbe607925a32f0dfc47550a4ddc3ec15bcb1115e'>patches</a>/<a href='/guix/log/gnu/packages/patches/ganeti-drbd-compat.patch?id=dbe607925a32f0dfc47550a4ddc3ec15bcb1115e'>ganeti-drbd-compat.patch</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/patches/ganeti-drbd-compat.patch?id=dbe607925a32f0dfc47550a4ddc3ec15bcb1115e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-07-16 21:51:43 +0200'>2020-07-16</span></td><td><a href='/guix/commit/gnu/packages/patches/ganeti-drbd-compat.patch?id=72a91d74cec01bfcfcef2b62c5b327fab82950b6'>gnu: Add ganeti.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/virtualization.scm (system-&gt;qemu-target, ganeti): New variables.
* gnu/packages/patches/ganeti-deterministic-manual.patch,
gnu/packages/patches/ganeti-disable-version-symlinks.patch,
gnu/packages/patches/ganeti-drbd-compat.patch,
gnu/packages/patches/ganeti-haskell-pythondir.patch,
gnu/packages/patches/ganeti-os-disk-size.patch,
gnu/packages/patches/ganeti-preserve-PYTHONPATH.patch,
gnu/packages/patches/ganeti-shepherd-master-failover.patch,
gnu/packages/patches/ganeti-shepherd-support.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
</span></span></td><td>Marius Bakke</td></tr>