hack: remove version from binaries, and remove symlinks

There may have been some historic reason for doing this, but I couldn't find
a practical use for building the (some) binaries with a version (default: "dev")
included, only to use a symlink to refer to the actual binary.

This patch removes the "${VERSION}" from the binary names in bundles, and
removes the code that created symlinks for them.

Before this patch:

```bash
rm -rf ./bundles
docker buildx build --build-arg VERSION=22.06.0-beta.1 --output ./bundles --target binary .

tree bundles
bundles
└── binary-daemon
    ├── containerd
    ├── containerd-shim-runc-v2
    ├── containerd-shim-runc-v2.md5
    ├── containerd-shim-runc-v2.sha256
    ├── containerd.md5
    ├── containerd.sha256
    ├── ctr
    ├── ctr.md5
    ├── ctr.sha256
    ├── docker-init
    ├── docker-init.md5
    ├── docker-init.sha256
    ├── docker-proxy -> docker-proxy-22.06.0-beta.1
    ├── docker-proxy-22.06.0-beta.1
    ├── docker-proxy-22.06.0-beta.1.md5
    ├── docker-proxy-22.06.0-beta.1.sha256
    ├── dockerd -> dockerd-22.06.0-beta.1
    ├── dockerd-22.06.0-beta.1
    ├── dockerd-22.06.0-beta.1.md5
    ├── dockerd-22.06.0-beta.1.sha256
    ├── dockerd-rootless-setuptool.sh
    ├── dockerd-rootless-setuptool.sh.md5
    ├── dockerd-rootless-setuptool.sh.sha256
    ├── dockerd-rootless.sh
    ├── dockerd-rootless.sh.md5
    ├── dockerd-rootless.sh.sha256
    ├── rootlesskit
    ├── rootlesskit-docker-proxy
    ├── rootlesskit-docker-proxy.md5
    ├── rootlesskit-docker-proxy.sha256
    ├── rootlesskit.md5
    ├── rootlesskit.sha256
    ├── runc
    ├── runc.md5
    ├── runc.sha256
    ├── vpnkit
    ├── vpnkit.md5
    └── vpnkit.sha256

1 directory, 38 files
```

After this patch:

```bash
rm -rf ./bundles
docker buildx build --build-arg VERSION=22.06.0-beta.1 --output ./bundles --target binary .

tree bundles
bundles
└── binary-daemon
    ├── containerd
    ├── containerd-shim-runc-v2
    ├── containerd-shim-runc-v2.md5
    ├── containerd-shim-runc-v2.sha256
    ├── containerd.md5
    ├── containerd.sha256
    ├── ctr
    ├── ctr.md5
    ├── ctr.sha256
    ├── docker-init
    ├── docker-init.md5
    ├── docker-init.sha256
    ├── docker-proxy
    ├── docker-proxy.md5
    ├── docker-proxy.sha256
    ├── dockerd
    ├── dockerd-rootless-setuptool.sh
    ├── dockerd-rootless-setuptool.sh.md5
    ├── dockerd-rootless-setuptool.sh.sha256
    ├── dockerd-rootless.sh
    ├── dockerd-rootless.sh.md5
    ├── dockerd-rootless.sh.sha256
    ├── dockerd.md5
    ├── dockerd.sha256
    ├── rootlesskit
    ├── rootlesskit-docker-proxy
    ├── rootlesskit-docker-proxy.md5
    ├── rootlesskit-docker-proxy.sha256
    ├── rootlesskit.md5
    ├── rootlesskit.sha256
    ├── runc
    ├── runc.md5
    ├── runc.sha256
    ├── vpnkit
    ├── vpnkit.md5
    └── vpnkit.sha256

1 directory, 36 files
```

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

1 files changed, 1 insertions, 1 deletions

diff --git a/hack/make/binary-proxy b/hack/make/binary-proxy
index 6d5245e015..011cf9d500 100644
--- a/hack/make/binary-proxy
+++ b/hack/make/binary-proxy
@@ -6,7 +6,7 @@ set -e
 	export CGO_ENABLED=0
 
 	GO_PACKAGE='github.com/docker/docker/cmd/docker-proxy'
-	BINARY_SHORT_NAME='docker-proxy'
+	BINARY_NAME='docker-proxy'
 
 	source "${MAKEDIR}/.binary"
 )