Fix so that valgrind checks actually works with CMake.
Fix so that valgrind checks actually works with CMake.

The valgrind tests where not run on the suites.

And valgrind was always returning 0 so set an explicit exit code on exit. I also had forgotten to change the name of TEST_WITH_VALGRIND to JANSSON_TEST_WITH_VALGRIND so that the tests would never use valgrind.

Vorne/jansson,markalanj/jansson,firepick1/jansson,slackner/jansson,Vorne/jansson,markalanj/jansson,AmesianX/jansson,wirebirdlabs/featherweight-jansson,liu3tao/jansson,wirebirdlabs/featherweight-jansson,OlehKulykov/jansson,slackner/jansson,liu3tao/jansson,akheron/jansson,Mephistophiles/jansson,npmccallum/jansson,firepick1/jansson,firepick1/jansson,bstarynk/jansson,bstarynk/jansson,AmesianX/jansson,akheron/jansson,OlehKulykov/jansson,npmccallum/jansson,markalanj/jansson,Mephistophiles/jansson,chrullrich/jansson,akheron/jansson,chrullrich/jansson,bstarynk/jansson