build: pam fix
build: pam fix

Set the HAVE_PAM option if the dependency is found *and* pam is
requested.

X-Gentoo-Bug: 821211
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=821211

williamh/openrc,OpenRC/openrc,williamh/openrc,OpenRC/openrc,williamh/openrc,OpenRC/openrc