Update krb5 module and re-enable pkinit tests

pkinit tests were disabled in cd0aca532091de4dfadf2f12b18dd99e9cba7615

Signed-off-by: Robbie Harwood <rharwood@redhat.com>

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15444)

krb5

@@ -1 +1 @@
-Subproject commit 3195e18f6608890866cf7a60ea538f4649d4fe82
+Subproject commit d6bf42279675100e3e4fe7c6e08eef74d49624cb

test/recipes/95-test_external_krb5_data/krb5.sh

@@ -13,7 +13,7 @@ CFLAGS="-I`pwd`/$BLDTOP/include -I`pwd`/$SRCTOP/include"
 
 cd $SRCTOP/krb5/src
 autoreconf
-./configure --with-ldap --with-prng-alg=os --disable-pkinit \
+./configure --with-ldap --with-prng-alg=os --enable-pkinit \
             --with-crypto-impl=openssl --with-tls-impl=openssl \
             CFLAGS="$CFLAGS" LDFLAGS="$LDFLAGS"