Only intern strings when we get a token from the lexer. Strings in tokens that have been pushed back have already been interned, so it's stupid to re-intern every time. This has required that the lexer permits its clients to modify the data members of the css_token object. That's fine, as it assumes nothing about them (they're basically just a window onto the internal lexer state, anyway).

svn path=/trunk/libcss/; revision=4857

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