add support for (Free)BSD extended attributes

enable with `./configure --with-attr` and `mimetype.use-xattr =
"enable"` in the config.

set attribute with:

    setextattr user Content-Type text/plain path/to/www/file

From: Moritz Wilhelmy <mw@barfooze.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2966 152afb58-edef-0310-8abb-c4023f1b3aa9
[build] use fortify flags with "extra-warnings"

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2967 152afb58-edef-0310-8abb-c4023f1b3aa9
[mod_dirlisting,mod_redirect,mod_rewrite] abort config parsing if pcre-compile fails or isn't available

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2968 152afb58-edef-0310-8abb-c4023f1b3aa9
[ssl] disable SSL3.0 by default

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2969 152afb58-edef-0310-8abb-c4023f1b3aa9