enable tests on f24+, support bootstrap

I think something (glib?) is too old on f23 for the tests

lensfun.spec

@@ -1,4 +1,8 @@
 
+%if !0%{?bootstrap} && 0%{?fedora} > 23
+%global tests 1
+%endif
+
 Name:    lensfun
 Version: 0.3.2
 Summary: Library to rectify defects introduced by photographic lenses
@@ -78,7 +82,7 @@ mkdir %{_target_platform}
 pushd %{_target_platform}
 %{cmake} .. \
   -DBUILD_DOC:BOOL=ON \
-  -DBUILD_TESTS:BOOL=ON \
+  -DBUILD_TESTS:BOOL=%{?tests:ON}%{!?tests:OFF} \
   -DCMAKE_BUILD_TYPE:STRING=Release
 popd
 
@@ -97,11 +101,14 @@ mkdir -p %{buildroot}/var/lib/lensfun-updates
 rm -fv %{buildroot}%{_bindir}/g-lensfun-update-data \
        %{buildroot}%{_mandir}/man1/g-lensfun-update-data.*
 
+
 %check
+%if 0%{?tests}
 pushd %{_target_platform}
 export CTEST_OUTPUT_ON_FAILURE=1
 ctest -vv
 popd
+%endif
 
 
 %post -p /sbin/ldconfig