correctly enable tests on Fedora (#1561473)

cmark.spec

@@ -1,12 +1,12 @@
-%if %{defined rhel}
-%if %{rhel} < 7
+%if 0%{?rhel} && 0%{?rhel} < 7
+%bcond_with tests
+%else
 %bcond_without tests
 %endif
-%endif
 
 Name:           cmark
 Version:        0.28.3
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        CommonMark parsing and rendering
 
 License:        BSD and MIT
@@ -99,6 +99,9 @@ make test
 
 
 %changelog
+* Mon Apr  2 2018 Jens Petersen <petersen@redhat.com> - 0.28.3-3
+- run tests on Fedora and RHEL7 (#1561473)
+
 * Wed Feb 07 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.28.3-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild