Fails to build with Xcode 10 on macOS Mojave, openssl and yaracpp issue

I've been trying to get this to build with Xcode 10 on macOS Mojave, but it seems to be running into trouble with 2 of the dependencies.



```

CMake Error at /Users/user/Software/RetDec/0.7/retdec-master/build/deps/openssl/openssl/src/openssl-stamp/openssl-build-Release.cmake:16 (message):

  Command failed: 2



   'make' '-j8'



  See also



    /Users/user/Software/RetDec/0.7/retdec-master/build/deps/openssl/openssl/src/openssl-stamp/openssl-build-*.log





make[2]: *** [deps/openssl/openssl/src/openssl-stamp/openssl-build] Error 1

make[1]: *** [deps/openssl/CMakeFiles/openssl.dir/all] Error 2

make[1]: *** Waiting for unfinished jobs....

```



...



```

CMake Error at /Users/user/Software/RetDec/0.7/retdec-master/build/external/src/yaracpp-project-stamp/yaracpp-project-build-Release.cmake:16 (message):

  Command failed: 2



   '/Applications/Xcode.app/Contents/Developer/usr/bin/make'



  See also



    /Users/user/Software/RetDec/0.7/retdec-master/build/external/src/yaracpp-project-stamp/yaracpp-project-build-*.log





make[2]: *** [external/src/yaracpp-project-stamp/yaracpp-project-build] Error 1

make[1]: *** [deps/yaracpp/CMakeFiles/yaracpp-project.dir/all] Error 2

```



Attached are the log files detailing the errors.



[openssl-build-err.log](https://github.com/avast-tl/retdec/files/2665301/openssl-build-err.log)

[yaracpp-project-build-err.log](https://github.com/avast-tl/retdec/files/2665302/yaracpp-project-build-err.log)



Based on the log file info, I suspect this issue may be related to Apple dropping support for 32-bit code.

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