Build Error due to openssl 0.9.24

[adrianbrink]

On macOS 10.14 (Mojave) running cargo build fails with

➜  substrate git:(master) cargo build
   Compiling openssl v0.9.24
   Compiling sr-io v0.1.0 (/Users/adrian/Desktop/code/polkadot/substrate/core/sr-io)
   Compiling safe-mix v1.0.0
   Compiling sr-sandbox v0.1.0 (/Users/adrian/Desktop/code/polkadot/substrate/core/sr-sandbox)
   Compiling trie-db v0.9.0 (https://github.com/paritytech/trie#b3b3209e)
   Compiling kvdb v0.1.0
   Compiling getset v0.0.6
   Compiling parking_lot v0.4.8
error: failed to run custom build command for `openssl v0.9.24`
process didn't exit successfully: `/Users/adrian/Desktop/code/polkadot/substrate/target/debug/build/openssl-6d9e1e02e1314785/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'Unable to detect OpenSSL version', /Users/adrian/.cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/build.rs:16:14
note: Run with `RUST_BACKTRACE=1` for a backtrace.

warning: build failed, waiting for other jobs to finish...
error: build failed

This issue is also described in #800 . Both openssl and libressl are installed with brew install openssl libressl.

The openssl v0.9.24 and openssl-sys v0.9.33 are pulled in through ws 0.7.8.

The two approaches I can currently think of are:

1. Overriding the openssl dependency with patch or replace
2. Upgrading ws to a later version.

[gavofyork]

Ok - so I guess we just need to upgrade ws then. @maciejhirsz ?

[bkchr]

I looked into this and we are using already the latest version of ws. So, patching/replacing is currently the only way for solving this. :(

[gavofyork]

fixed.

[adrianbrink]

Confirmed the fix on macOS 10.14.