perl-crypt-blowfish: add missing license declaration

The license of this package is not standard, it is a combination of two
sets of statements coming from two different authors.

The license resembles the original 4-clause BSD license (thus including
advertising clause) but without the third clause about endorsement.
The label 'BSD-4-Clause-like' nevertheless seems the closest match.

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

package/perl-crypt-blowfish/perl-crypt-blowfish.mk

@@ -7,6 +7,7 @@
 PERL_CRYPT_BLOWFISH_VERSION = 2.14
 PERL_CRYPT_BLOWFISH_SOURCE = Crypt-Blowfish-$(PERL_CRYPT_BLOWFISH_VERSION).tar.gz
 PERL_CRYPT_BLOWFISH_SITE = $(BR2_CPAN_MIRROR)/authors/id/D/DP/DPARIS
+PERL_CRYPT_BLOWFISH_LICENSE = BSD-4-Clause-like
 PERL_CRYPT_BLOWFISH_LICENSE_FILES = COPYRIGHT
 
 $(eval $(perl-package))