Back out Unix domain socket related patches for Tor Browser 6.5
We did not get the Unix domain socket support finished in the 6.5aX timeline and need to back out the patches for 6.5 stable. (For the background see: #20761 (moved)). According to mcs:
we will need to back out:
> * 8871259c966755233b134a5ddb2b4926539d25c6 (#14272)
> * fa4e114a20067810af0c5cc6a57aa6e849386418 (#14272 fixup)
> * 8ca52414916c3d8bc2a2974017d759901ddc1736 (#20111)
> * 4dd8f6130f931616cf014e0ded444c30e04c8bad (#20185)
>
> There are also Torbutton patches for #14272 and #20111, although it may be okay to leave the code in place (the code implements fallbacks).
I think we should back out the Torbutton ones as well to not risk any inteference we have not tested. There are tor-browser backports as well we can think about backing out.