lighttpd: backport a fix for CVE-2022-22707

Backport the fix for CVE-2022-22707, a buffer overflow in mod_extforward.

(From OE-Core rev: d54d7e7b)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 77585966)
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 7695d11dd09b1e9e87d6741135d0b28e82672f0a)
Signed-off-by: Purushottam Choudhary <purushottam.choudhary@kpit.com>
Signed-off-by: Purushottam Choudhary <purushottamchoudhary29@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>