libtextstyle 0.8: confused with classes that are suffixes of others

[Akim Demaille]

libtextstyle confuses class names when one is a suffix of another.

To reproduce it, take the hello example from libtextstyle 0.8, and replace with 
the attached files that use classes bar and foobar.  And see that Maria and 
Fred are printed in blue.

Note that it matters that the class foobar is defined before the class bar.  In 
the other sense, the problem does not appear.  So libcroco seems to be the 
culprit.

Cheers!

hello-default.css
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hello.c
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