Rename variable class to support compilation as part of an C++ project.

[timhoffm]

I'm including the synctex sources as part of an C++ project. However, the variable name class does not work with g++ because it's a reseved symbol.

synctex_parser_advanced.h:

struct synctex_node_t {
    ...
    synctex_class_p class;
}

Our current workaround is to rename that variable in our local copy of the code.

Could you please change that variable to another name, so that I can use new versions of synctex without having to adapt our local copy every time. class_ or nclass (for node class) would be reasonable alternatives. If desired, I can provide a pull request since I've done the changes anyway.

[jlaurens]

Fixed in 1.21 class → class_

[timhoffm]

Thanks!