package/libkrb5: fix LICENSE list

The NOTICE file contains a long list of licenses. A few of them are MIT,
BSD-2-Clause, BSD-3-Clause, or BSD-4-Clause. And then there are many
that are somewhat similar but not exactly.

Mention all the "known" licenses in LIBKRB5_LICENSE, and add "others" to
indicate that there is more.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 3cffd1d68bfeb30c2e4aa826550d5f5aeb7b4678)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libkrb5/libkrb5.mk

@@ -9,7 +9,7 @@ LIBKRB5_VERSION = $(LIBKRB5_VERSION_MAJOR).4
 LIBKRB5_SITE = https://web.mit.edu/kerberos/dist/krb5/$(LIBKRB5_VERSION_MAJOR)
 LIBKRB5_SOURCE = krb5-$(LIBKRB5_VERSION).tar.gz
 LIBKRB5_SUBDIR = src
-LIBKRB5_LICENSE = MIT
+LIBKRB5_LICENSE = MIT, BSD-2-Clause, BSD-3-Clause, BSD-4-Clause, others
 LIBKRB5_LICENSE_FILES = NOTICE
 LIBKRB5_CPE_ID_VENDOR = mit
 LIBKRB5_CPE_ID_PRODUCT = kerberos_5