htags doesn't properly escape characters in filenames

[Justin Wojdacki]

i've observed that if the input source filename contains a regex 
special character such as '+', then at line 645 of htags, where a link 
is being built up, there will be a problem.

i noticed this originally because a header is named like "foo++.h". a 
simple solution to this would be to add the following one line prior, 
but it doesn't address other regex special characters.

                $name =~ s/\+/\\\+/g;

justin wojdacki
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