Installing with homebrew fails due to OpenSSL bug

If you try to install git-crypt on a clean machine, the following happens:

```
==> Installing git-crypt dependency: openssl
==> Downloading https://www.openssl.org/source/openssl-1.0.1j.tar.gz
Already downloaded: /Library/Caches/Homebrew/openssl-1.0.1j.tar.gz
==> perl ./Configure --prefix=/usr/local/Cellar/openssl/1.0.1j_1 --openssldir=/usr/local/etc/openssl no-ssl2 zlib-dynamic shared enable-cms darwin64-x86_64-cc enable-ec_nistp_64_gcc_
==> make depend
==> make
==> make test
bew/usr/bin/perl cms-test.pl
CMS => PKCS#7 compatibility tests
signed content DER format, RSA key: verify error
make[1]: *** [test_cms] Error 1
make: *** [tests] Error 2

```

This seems to be caused by this bug: https://bugzilla.redhat.com/show_bug.cgi?id=1335097