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Revert of [Chromoting] Remove wildcard ('*') from remoting_all target. (patchset #8 id:140001 of https://codereview.chromium.org/896743004/)

Reason for revert:
It cause ChromiumOS.Chromium and PFQ bots to fail. The reason might because chroot didn't have "dpkg-architecture" command. The correct solution might be add "dpkg-architecture" command to chroot. But this CL currently break PFQ and a bunch of bots. So revert it for immediate fix.
See crbug.com/456491

Original issue's description:
> [Chromoting] Remove wildcard ('*') from remoting_all target.
>
> Support for the wildcard is going away in GN, so this helps prepare for the transition away from GYP.
>
> This cl adds dummy targets so that that logic for when the proper targets should be build can be kept in the platform-specific files.
>
> Some of the conditions in the host gyp files needed to be restructured so that the dummy targets would be defined only when necessary.  The updated conditions caused a lot of lines to be re-indented, but the target definitions are the same (except for the new dummy targets).
>
> BUG=
>
> Committed: https://crrev.com/9fb75ed89c0ae4ced679576f9cf030cc8c30e928
> Cr-Commit-Position: refs/heads/master@{#315150}

TBR=kelvinp@chromium.org,garykac@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/905223002

Cr-Commit-Position: refs/heads/master@{#315261}