disable PyQwt support on f26++

PyQwt currently FTBFS and has broken deps

qgis.spec

@@ -16,7 +16,7 @@
 
 Name:           qgis
 Version:        2.18.2
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        A user friendly Open Source Geographic Information System
 Group:          Applications/Engineering
 
@@ -69,7 +69,7 @@ BuildRequires:  postgresql-devel
 BuildRequires:  proj-devel
 BuildRequires:  PyQt4-devel
 # PyQwt doesn't support qwt6, so just turn it off for now on RHEL
-%if 0%{?fedora}
+%if 0%{?fedora} < 26
 BuildRequires:  PyQwt-devel
 %endif
 BuildRequires:  python2-devel
@@ -405,6 +405,9 @@ update-mime-database %{?fedora:-n} %{_datadir}/mime &> /dev/null || :
 
 
 %changelog
+* Sun Jan 01 2017 Rex Dieter <rdieter@math.unl.edu> - 2.18.2-2
+- rebuild (sip), disable PyQwt support (f26+, for now)
+
 * Fri Dec 16 2016 Volker Froehlich <volker27@gmx.at> - 2.18.2-1
 - New upstream release