DEL character is counted in XS Paragraph

[Patrice Dumas]

Hello,

In l 227 of Texinfo/Convert/ParagraphNonXS.pm, DEL characters are not
counted 
        # We don't count DEL bytes here for INFO_SPECIAL_CHARS_QUOTE. 

I think that the same is not done in the XS equivalent code
l 720 of Texinfo/XS/xspara.c, w should probably be compared to DEL and
len increased only if w is not DEL.

(Found by comparing XS/NonXS test results).

-- 
Pat