Revert make test conditional change

Previous commit incorrectly changed condition for running 'make test'
from 0%{?rhel} != 6 to 0%{?rhel} > 6 with intention to make it more
obvious that tests are enabled on RHEL/EPEL 7 and later, but it
unintentionally disabled tests on Fedora (and possibly other distros).

p7zip.spec

@@ -122,7 +122,7 @@ chmod +x %{buildroot}%{_bindir}/p7zipForFilemanager
 %endif
 
 %check
-%if 0%{?rhel} > 6
+%if 0%{?rhel} != 6
 make test
 %endif
 # Next test fails, because we don't have X11 envoirment ...