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
ue='5c59ded756a1ec454db806e2cad25300d4d9966a'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=5c59ded756a1ec454db806e2cad25300d4d9966a'>root</a>/<a href='/guix/log/tests?id=5c59ded756a1ec454db806e2cad25300d4d9966a'>tests</a>/<a href='/guix/log/tests/signing-key.pub?id=5c59ded756a1ec454db806e2cad25300d4d9966a'>signing-key.pub</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/tests/signing-key.pub?id=5c59ded756a1ec454db806e2cad25300d4d9966a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>