fix code listing in dark mode

change error message

error if PATH_INFO is not defined

fix quoting when overriding the default conf/user/socket

tp_head/foot can be called with clt->clt_pc NULL; handle it it happens when there's an error or we don't have a match for the proxy.

typo; continue instead of break if fcgi_abort_request fails the `fcgi' pointer is no longer valid, but we may still have to cleanup other inflight fcgi connections.

event_del only when we have a socket

fix crash if path is NULL

use -1 instead of WAIT_ANY for portability

wops, forgot to bundle setres{g,u}id in the tarball

checks/compats for setres{gid,uid}

u_char -> unsigned char for portability

fix pre on netsurf netsurf' css lib doesn't seem to support `initial', so provide a fallback for it.

hide some debugging code behind a DPRINTF

fix -MMD test runtest first tries *without* the given extra-cflags, so -MMD was never added. singletest, instead, always use the args