rules/ remove run_under

rules/ were never meant to be added to the release. Now that we are not
*running* multi-arch binaries, we can remove the infrastructure that was
necessary to do so.

I may get back to this -- but we need to dust quite a bit off before
that happens.

test/windows/BUILD

@@ -9,15 +9,6 @@ cc_binary(
     tags = ["manual"],
 )
 
-# TODO(motiejus): bring back windows tests, not only builds
-#platform_test(
-#    name = "winver_windows_amd64",
-#    src = "winver",
-#    platform = "//platform:windows_amd64",
-#    run_under = "wine64-stable",
-#    tags = ["no-sandbox"],
-#)
-
 platform_binary(
     name = "winver_windows_amd64",
     src = "winver",