fix usage of AC_LANG_PROGRAM (933bf8e from 0.9)

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd-0.8@2074 ef36b2f9-881f-0410-afb5-c4e39611909c
also support poll() returning EAGAIN (2f088ec from 0.9)

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd-0.8@2075 ef36b2f9-881f-0410-afb5-c4e39611909c
update from latest automake

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd-0.8@2076 ef36b2f9-881f-0410-afb5-c4e39611909c
update README (mostly from 0.9 branch)

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/nss-pam-ldapd-0.8@2077 ef36b2f9-881f-0410-afb5-c4e39611909c