test/util: remove eq_any()

It was added in the parent commit, but ended up not being used. And
I can't think of a case where it will be used: instead we would probably
want to generalize expect_msg_seq() if necessary.

test/functional/helpers.lua

@@ -14,7 +14,6 @@ local check_cores = global_helpers.check_cores
 local check_logs = global_helpers.check_logs
 local neq = global_helpers.neq
 local eq = global_helpers.eq
-local eq_any = global_helpers.eq_any
 local ok = global_helpers.ok
 local map = global_helpers.map
 local filter = global_helpers.filter
@@ -733,7 +732,6 @@ local module = {
   curwinmeths = curwinmeths,
   dedent = dedent,
   eq = eq,
-  eq_any = eq_any,
   eval = nvim_eval,
   exc_exec = exc_exec,
   expect = expect,