netpanzer-0.8.7-1.fc26 is not built with $RPM_OPT_FLAGS. Looks like the related optflags patch was simply commented out in the last update without an apparent reason.
netpanzer-0.8.7-2.fc25 has been submitted as an update to Fedora 25. https://bodhi.fedoraproject.org/updates/FEDORA-2016-9b4c23d87e
netpanzer-0.8.7-2.fc25 has been pushed to the Fedora 25 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-9b4c23d87e
netpanzer-0.8.7-2.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.