fix memleak in mod_auth (fixes #2457, thx brarcher)

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/trunk@2904 152afb58-edef-0310-8abb-c4023f1b3aa9
configure.ac: remove old stuff, add some new to fix warnings in automake 1.12

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/trunk@2905 152afb58-edef-0310-8abb-c4023f1b3aa9
fix link order for -Wl,--as-needed

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/trunk@2906 152afb58-edef-0310-8abb-c4023f1b3aa9
fix ipv6 disabling (fixes #2292, thx bert)

having ntop should not automatically enable ipv6, especially if ipv6 was
disabled in the configure options.

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/trunk@2907 152afb58-edef-0310-8abb-c4023f1b3aa9