krb5: Backport patch to fix parallel build

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Eric Bénard <eric@eukrea.com>
krb5: Add PACKAGECONFIG and new configure param to disable keyutils detection

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Eric Bénard <eric@eukrea.com>