Yong Tang 15165b99b6 Add required pkg-config for Dockerfile.simple
This fix tries to address the issue raised in 35980 where
pkg-config was missing and was causing Dockerfile.simple build
to fail.

```
$ docker build -t docker:simple -f Dockerfile.simple .
..........
CGO_ENABLED=1 go build  -tags "seccomp apparmor selinux netgo cgo static_build" -installsuffix netgo -ldflags "-w -extldflags -static -X main.gitCommit="b2567b37d7b75eb4cf325b77297b140ea686ce8f" -X main.version=1.0.0-rc4+dev " -o runc .
pkg-config: exec: "pkg-config": executable file not found in $PATH
make: *** [static] Error 2
Makefile:42: recipe for target 'static' failed
The command '/bin/sh -c /tmp/install-binaries.sh runc containerd tini proxy dockercli' returned a non-zero code: 2
```

This fix fixes 35980.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
Upstream-commit: a018046ad0462c78601863784d3b882e77a7281b
Component: engine
2018-01-11 20:12:16 +00:00
S
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