perl-mime-base64-urlsafe: add missing license declaration

Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/perl-mime-base64-urlsafe/perl-mime-base64-urlsafe.mk

@@ -7,6 +7,7 @@
 PERL_MIME_BASE64_URLSAFE_VERSION = 0.01
 PERL_MIME_BASE64_URLSAFE_SOURCE = MIME-Base64-URLSafe-$(PERL_MIME_BASE64_URLSAFE_VERSION).tar.gz
 PERL_MIME_BASE64_URLSAFE_SITE = $(BR2_CPAN_MIRROR)/authors/id/K/KA/KAZUHO
+PERL_MIME_BASE64_URLSAFE_LICENSE = Artistic or GPL-1.0+
 PERL_MIME_BASE64_URLSAFE_LICENSE_FILES = README
 
 $(eval $(perl-package))