cve-check: restore CVE_CHECK_SHOW_WARNINGS functionality
Commit
05ef4f2a7b225c8d230eaca8d333ffb921729d79 removed this
functionality by accident. It was implemented in text exporter, while it
should have been a global feature independent on exporter type to avoid
such accidental deletion.
Signed-off-by: Peter Marko <peter.marko@siemens.com>
Cc: Marta Rybczynska <marta.rybczynska@ygreky.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>