add dependencies for `pkg-config`

Otherwise, it complains:

    run pkg_config fail: "Failed to run `\"pkg-config\" \"--libs\" \"--cflags\" \"openssl\"`: No such file or directory (os error 2)"
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guanqun 2019-09-26 23:54:37 +08:00 committed by GitHub
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@ -22,6 +22,7 @@ Cargo requires the following tools and packages to build:
* `git`
* `python`
* `curl` (on Unix)
* `pkg-config` (on Unix, used to figure out the `libssl` headers/libraries)
* OpenSSL headers (only for Unix, this is the `libssl-dev` package on ubuntu)
* `cargo` and `rustc`