[Bug 1092759] gzseek calls can incorrectly position the file.

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1092759

--- Comment #2 from [e-mail] ---
The native executable does not show the problem because of conditional
compilation and support for large files.  It is only seen with the mingw* built
executables which don't get created with large file support.  If we could build
mingw-zlib with large file support that would alleviate the issue.

rhel 6 mingw32 works with the test case because it is built with a version of
zlib before large file support was added to zlib.