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parse_tags: don't recurse for nested \t()
This fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=4892 (stack overflow on deeply nested \t()). This is possible because parentheses do not nest and the first ')' terminates the whole tag. Thus something like \t(\t(\t(\t(\t() can be read in a simple loop with no recursion required. Recursion is also not required if the ')' is missing entirely and the outermost \t(... never ends. See #296 for more backstory.
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