[Bug libstdc++/72830] istream::seekg should not reset eofbit if -std=c++98

[alexhenrie24 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72830

--- Comment #2 from Alex Henrie <alexhenrie24 at gmail dot com> ---
All versions of GCC 5 and GCC 6 have the same problem.