MAKE: Remove PAM libraries from libsss_simple
    
    libsss_simple does not call any pam function.
    
    sh-4.2$ nm --dynamic --undefined-only .libs/libsss_simple.so | grep pam
    sh-4.2$ echo $?
    1
    
    Reviewed-by: Sumit Bose <sbose@redhat.com>
    (cherry picked from commit 5385172799f6dea59fe1c0ef8f482db59bfc9c5c)