wix: restore COPYING.rtf
This got truncated to 0 bytes in 0ab651b5f77c when the Phabricator extension
crashed because it's a binary file. That caused the license page in the WIX
installer to be empty. I don't remember if I needed to resubmit after the bug
was fixed, so let's try this again with the current stable. If this fails, I'll
retry with 5.1 to see if this is a regression in the API changeover last cycle.
Differential Revision: https://phab.mercurial-scm.org/D8052
== Local
Ready.
Un and Deux
Eins und Zwei
One and Two
Eins und Zwei
Uno und Due
== Remote
Ready.
REQ: foo?one=Vo&two=Efvy
-> Vo!boe!Efvy
Un and Deux
REQ: bar?b=Fjot&a=[xfj
-> Fjot!voe![xfj
Eins und Zwei
REQ: batch?cmds=foo:one=Pof,two=Uxp;bar:b=Fjot,a=[xfj;bar:b=Vop,a=Evf
-> Pof!boe!Uxp;Fjot!voe![xfj;Vop!voe!Evf
One and Two
Eins und Zwei
Uno und Due