Don't remove external files on distclean
Don't remove external files on distclean

OpenSC/pam_p11,OpenSC/pam_p11,AktivCo/pam-p11-gost,AktivCo/pam-p11-gost,ffsdmad/pam_p11,AktivCo/pam-p11-gost,ffsdmad/pam_p11